When joining a server, the backpack contents is scrambled. Sometimes this means that some items won't fit and then they are lost.
- Legacy ID
Fill backpack with lots of stuff.
Leave server, join server, repeat a few times.
Hello magmatrix and thank you for the report.
This is an issue we are aware of and it has been scheduled for a fix. Currently there is a system in place which drops the items that would get deleted before on the ground while logging in.