One of my players told me they still had their items in their backpack when he respawned after getting killed.
Config is setup to drop the backpack on death and havent been able to reproduce the issue.

Have you granted any players the backpacks.keepondeath permission?

WhiteThunder

Have you granted any players the backpacks.keepondeath permission?

Negative

{
  "Drop on Death (true/false)": true,
  "Erase on Death (true/false)": false,
  "Use Blacklist (true/false)": false,
  "Clear Backpacks on Map-Wipe (true/false)": false,
  "Only Save Backpacks on Server-Save (true/false)": false,
  "Blacklisted Items (Item Shortnames)": [
    "autoturret",
    "lmg.m249"
  ],
  "GUI Button": {
    "Image": "https://i.imgur.com/CyF0QNV.png",
    "Background color (RGBA format)": "1 0.96 0.88 0.15",
    "GUI Button Position": {
      "Anchors Min": "0.5 0.0",
      "Anchors Max": "0.5 0.0",
      "Offsets Min": "185 18",
      "Offsets Max": "245 78"
    }
  },
  "Softcore": {
    "Reclaim Fraction": 0.5
  },
  "Backpack Size (1-7 Rows)": 1
}

this is the config, and the only perms players have is the use and use.1-7 permission