On the Mineplex server survival mode there is a feature that allows you to create a 'home', this is an area that you can claim allowing only yourself to build on/open chests etc. I saved and quitted the game and then came back to the world a few days later, only to find a few things, for example the door, were changed, I go to open my chests and it comes up with the message 'you are not allowed to build on this players land'. This should not happen since it should be my land, what should have happened was a) nobody should have been able to build on my land and b) it should allow me to build/open chests etc on my land. Given that both some things have changed and I am not allowed to build on the land it leads me to believe that someone has somehow laid a claim to the land as their home and this has somehow usurped mine, but that's just my opinion. This has happened before with a home I had, that time I just thought I'd leave it be and start a new one, there is no point in me playing the game if all my progress is just going to be randomly periodically wiped/stolen. Unfortunately I do not know how to reproduce this bug since it happens out of the blue, maybe try to create a home 'on top of' someone else's?