while taking damage a "you died" screen will show up even if you had not taken enough damage to die, when you press respawn it will keep you at the area you "died" at with all of your levels and items as well.

how to (maybe) replicate the bug: take multiple attacks at once

i was at my zombie spawner and was attacked by a few of them at the same time. maybe that is the issue? this bug was encountered on a server