upto today this plugin was working fine - now when i type /cargo it says next one in 2hours
now it still says 2 hours but then the cargo appears on the map and when i do /cargo it says next one in 56 mins
So cargo ship is spawning every hour now.
Not sure if one is Vanilla spawn.

here is my config 

{
"Event Timers in seconds": {
"Cargo": {
"Max": 7500.0,
"Min": 7000.0
},
"Chinook": {
"Max": 0.0,
"Min": 0.0
},
"Helicopter": {
"Max": 0.0,
"Min": 0.0
}
}
}

One of them might be a vanilla spawn.

I will add an option to disable default server spawns for every type of event in the next update.