Rollback Bug?

I have a great server but theres one things thats stopping it from being great. Theres this bug when you disconnect from my server it puts you back like 2 hours of what you have played like at the same spot and the same items you had 2 hours ago. It does it everytime someone logs off. You can come see if you want i need this fixed ASAP.

IP : 199.30.48.230:25576

Once you joined say PMC