Seb_BuildsAlot

So i play on a server with a bunch of my friends, its a survival server with few plugins. But for some reason they are starting to complain about progress not being saved, I have had 2 run ins so far and i want to put an end to it, heres an example of a problem: they just cleared out a bunch of trees, then enchanted their armour and tools and logged off for the night, they relog the next day to find that the trees are suddenly back and the tools and enchants are reset to the way they were before, Now i can fix the trees using the core protect rollback buti cant rollback armour and tools. But this still wont stop it from happening again, does anybody have any idea how to fix this problem because its ruining the experince for my players.