myping0

So basically i made a server and 2 of my friends are playing on it too. We played a bit and then when we logged off and came back later, all of our inventories were cleared. The world was the same, mined areas remained mined etc but everything we had disappeared. We tested it out and we cant seem to find the problem, we even tried gamerule keepinventory true, but leaving just resets our inventory. We do have a bunch of mods (around 25)but they have nothing to do with inventory (at least I dont think). Can anyone help? Im new to making a server so any help on this would be really appreciated Thanks (yes i did properly disconnect from the server and typed in STOP in the console)