I was playing on my sky factory server and the stuff from the mod or whatever it is disappeared.

So I bought Sky factory and I've been playing it for 2 days now and today while I was playing some of my which is part of the mod or whatever disappeared and i tried re-loging, checked to make sure the mod was installed, and even restarted my application and when I got back on my stuff wasn't there. The items that disappeared was my crushers, villagers, sifts all disappeared. Also i left a villager in the spot the world spawned it in and it was still there but everything else was gone.