Scheduling from ruleset pvp to ruleset default sometimes doesn't work.
When it doesn't work there are reports from players, so it's not clear if this happens all the time or just sometimes.
If I don't change the contents of the json file and reload the plugin, the ruleset default behaves as expected.

The contents of the json file are as follows.

{
"Config Version": "2.3.1",
"Default RuleSet": "default",
"Configuration Options": {
"Armor damage (PVE)": {
"Skin IDs which are immune to damage": [],
"Enable support for npcs to cause armor damage on hit": false,
"Play headshot sound when a player is headshot by an npc": false
},
"Loot": {
"Auto lock (codelock, keylock, nothing)": {
"cupboard.tool.deployed": "nothing"
},
"Exceptions for locks to various containers option": [
"skulltrophy.deployed",
"skull_fire_pit",
"bbq.static",
"small_refinery_static",
"campfire"
],
"Enable support to allow adding locks to various containers": false,
"Enable codelock anti-raiding (team/clan/friend access only)": false,
"Protect unlocked TC from being accessed by enemy players": false,
"Prevent player shield from dropping on death": false,
"Prevent player active item from dropping on death": false,
"Prevent player backpack from dropping on death (Rust backpack)": false,
"Prevent players from using enemy car lifts": false
},
"Reflect PVP Damage Multipliers (0 = disabled, 1 = 100%)": {
"Multiplier Allows Armor Protection": true,
"Arrow Damage": 0.0,
"Blunt Damage": 0.0,
"Bullet Damage": 0.0,
"Slash Damage": 0.0,
"Stab Damage": 0.0
},
"TwigDamage (FLAG)": {
"Apply To Twig (when TwigDamage flag is not set": false,
"Apply To Wood": false,
"Apply To Stone": false,
"Apply To Metal": false,
"Apply To HQM": false,
"Require Owner Online": false,
"Log Offenses": false,
"Notify Offenders": false,
"Reflect Damage Multiplier": 0.0,
"Multiplier Allows Armor Protection": true
},
"handleDamage": true,
"useZones": true,
"Trace To Player Console": false,
"Trace To Server Console": true,
"Log Trace To File": true,
"Maximum Distance From Player To Trace": 50.0,
"Prevent Water From Extinguishing BaseOven": false,
"Prevent Players From Being Marked Hostile": false,
"Allow PVP Below Height": -500.0,
"Allow PVP Above Height": 5000.0,
"Allow Other Damage Below Height": -500.0,
"Allow Other Damage Above Height": 5000.0,
"Allow Cold Metabolism Damage": true,
"Allow Heat Metabolism Damage": true,
"Allow Thirst And Hunger Damage To Farmable Animals": true
},
"Mappings": {
"default": "default",
"pvp": "pvp"
},
"Schedule": {
"enabled": true,
"useRealtime": true,
"broadcast": false,
"entries": [
"0.21:00 pvp",
"1.00:00 defalt",
"2.21:00 pvp",
"3.00:00 default",
"4.19:00 pvp",
"5.00:00 default"
]
},
"RuleSets": [
{
"name": "default",
"enabled": true,
"defaultAllowDamage": false,
"flags": "HopperCannotTargetEnemyLoot, AuthorizedFarmableDamage, HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal, TrapsIgnorePlayers, TwigDamage, WoodenDamage, AdminsHurtSleepers, AdminsHurtPlayers, SelfDamage, FriendlyFire, NoMLRSDamage, AuthorizedDamage, CupboardOwnership, AuthorizedDamageRequiresOwnership, AuthorizedDamageCheckPrivilege, TurretsIgnoreScientist",
"rules": [
"anything can hurt dispensers",
"anything can hurt resources",
"anything can hurt barricades",
"anything can hurt traps",
"anything can hurt heli",
"anything can hurt npcs",
"anything can hurt players",
"nothing can hurt ch47",
"nothing can hurt cars",
"nothing can hurt mini",
"nothing can hurt snowmobiles",
"nothing can hurt ridablehorses",
"players cannot hurt players",
"players cannot hurt traps",
"players cannot hurt autoturret",
"players cannot hurt tugboats",
"players cannot hurt farm",
"players cannot hurt cars",
"players cannot hurt ridablehorses",
"players cannot hurt barricades",
"players cannot hurt highwalls",
"cars cannot hurt anything",
"mini cannot hurt anything",
"ch47 cannot hurt anything",
"scrapheli cannot hurt anything",
"attackheli cannot hurt anything",
"fire cannot hurt players",
"traps cannot hurt players",
"autoturret can hurt players",
"highwalls cannot hurt players",
"mini cannot hurt mini",
"npcs can hurt players",
"junkyard cannot hurt anything",
"junkyard can hurt cars",
"heliturrets cannot hurt players",
"ramhead can hurt ramhead",
"siege cannot hurt players",
"molotov_fire cannot hurt BuildingBlocks",
"molotov_fire cannot hurt players"
]
},
{
"name": "pvp",
"enabled": true,
"defaultAllowDamage": true,
"flags": "HumanNPCDamage, AuthorizedDamage",
"rules": [
"anything can hurt dispensers",
"anything can hurt resources",
"anything can hurt barricades",
"anything can hurt traps",
"anything can hurt heli",
"anything can hurt npcs",
"anything can hurt players",
"junkyard cannot hurt anything",
"junkyard can hurt cars"
]
}
],
"Entity Groups": [
{
"name": "barricades",
"members": "door_barricade_a, door_barricade_a_large, door_barricade_b, door_barricade_dbl_a, door_barricade_dbl_a_large, door_barricade_dbl_b, door_barricade_dbl_b_large, gingerbread_barricades_house, gingerbread_barricades_snowman, gingerbread_barricades_tree, wooden_crate_gingerbread",
"exclusions": "barricade.concrete, barricade.sandbags, barricade.stone"
},
{
"name": "barricades2",
"members": "spikes_static, barricade.metal, barricade.wood, barricade.woodwire, spikes.floor, icewall, GraveyardFence",
"exclusions": ""
},
{
"name": "dispensers",
"members": "BaseCorpse, HelicopterDebris, PlayerCorpse, NPCPlayerCorpse, HorseCorpse, SkyLantern, Pinata, VineSwingingTree",
"exclusions": ""
},
{
"name": "fire",
"members": "FireBall, FlameExplosive, FlameThrower, BaseOven, FlameTurret, rocket_heli_napalm, napalm, oilfireball2",
"exclusions": ""
},
{
"name": "molotov_fire",
"members": "fireball_small_molotov",
"exclusions": ""
},
{
"name": "guards",
"members": "bandit_guard, scientistpeacekeeper, sentry.scientist.static, sentry.bandit.static",
"exclusions": ""
},
{
"name": "heli",
"members": "PatrolHelicopter, oilfireballsmall, heli_napalm, rocket_heli, rocket_heli_napalm",
"exclusions": ""
},
{
"name": "highwalls",
"members": "SimpleBuildingBlock, wall.external.high.ice, gates.external.high.stone, gates.external.high.wood",
"exclusions": ""
},
{
"name": "ridablehorses",
"members": "RidableHorse",
"exclusions": ""
},
{
"name": "cars",
"members": "BasicCar, ModularCar, BaseModularVehicle, BaseVehicleModule, VehicleModuleEngine, VehicleModuleSeating, VehicleModuleStorage, VehicleModuleTaxi, ModularCarSeat, Bike",
"exclusions": ""
},
{
"name": "mini",
"members": "minicopter.entity",
"exclusions": ""
},
{
"name": "scrapheli",
"members": "ScrapTransportHelicopter",
"exclusions": ""
},
{
"name": "ch47",
"members": "ch47.entity",
"exclusions": ""
},
{
"name": "attackheli",
"members": "attackheli",
"exclusions": ""
},
{
"name": "npcs",
"members": "ch47scientists.entity, BradleyAPC, CustomScientistNpc, ScarecrowNPC, HumanNPC, NPCPlayer, ScientistNPC, TunnelDweller, SimpleShark, UnderwaterDweller, ZombieNPC, SnakeHazard",
"exclusions": ""
},
{
"name": "players",
"members": "BasePlayer, FrankensteinPet",
"exclusions": ""
},
{
"name": "resources",
"members": "ResourceEntity, TreeEntity, OreResourceEntity, LootContainer, NaturalBeehive",
"exclusions": "hobobarrel.deployed"
},
{
"name": "snowmobiles",
"members": "snowmobile, tomahasnowmobile",
"exclusions": ""
},
{
"name": "traps",
"members": ", BearTrap, FlameTurret, Landmine, GunTrap, ReactiveTarget, TeslaCoil, spikes.floor",
"exclusions": ""
},
{
"name": "autoturret",
"members": "AutoTurret",
"exclusions": ""
},
{
"name": "junkyard",
"members": "magnetcrane.entity, carshredder.entity",
"exclusions": ""
},
{
"name": "tugboats",
"members": "Tugboat",
"exclusions": ""
},
{
"name": "heliturrets",
"members": "turret_attackheli",
"exclusions": ""
},
{
"name": "ramhead",
"members": "BatteringRamHead",
"exclusions": ""
},
{
"name": "siege",
"members": "SiegeTower, Catapult, Ballista, BallistaGun, BatteringRam, ConstructableEntity",
"exclusions": ""
},
{
"name": "bees",
"members": "BeeSwarmAI, Beehive, BeeGrenade, BeeSwarmMaster, NaturalBeehive",
"exclusions": ""
},
{
"name": "farm",
"members": "simplechicken.entity, FarmableAnimal, ChickenCoop",
"exclusions": ""
},
{
"name": "BuildingBlocks",
"members": "BuildingBlock",
"exclusions": ""
}
],
"Allow Killing Sleepers": false,
"Allow Killing Sleepers (Ally Only)": false,
"Allow Killing Sleepers (Authorization Only)": false,
"Allow Killing Sleepers (After X Hours Offline)": 0.0,
"Allow Killing Sleepers (Allowed steam ids)": [
0
],
"Ignore Firework Damage": true,
"Ignore Campfire Damage": false,
"Ignore Ladder Damage": false,
"Ignore Sleeping Bag Damage": false,
"Players Can Trigger Traps In Monument Topology": true,
"Players Can Hurt Traps In Monument Topology": false,
"Players Can Trigger Turrets In Monument Topology": true,
"Players Can Hurt Turrets In Monument Topology": false,
"Block Scrap Heli Damage": false,
"Block Igniter Damage": false,
"Block Wallpaper Damage": true,
"Block Radioactive Water Damage": false,
"Block Decay Damage To Vehicles": false,
"Prevent heli from strafing in the inner radius of safe zones": false,
"Prevent players from throwing water in arctic and tundra biome": false,
"Prevent ragdolling when struck by another vehicle": true,
"Experimental ZoneManager support for PVE zones": false

heya, 

"1.00:00 defalt",

this can cause it to continue using the pvp entry since defalt is invalid, and should be default

Thank you very much for finding the problem.
The reason why the ruleset becomes default after reloading the plugin is because
"Default RuleSet": "default",
the above setting is working.

Thank you very much.