Death messages are completely messed up.

Instead of messages like:
MrParody was shot by Skeleton
MrParody was slain by Zombie

It said:
was shot by MrParody
was slain by MrParody

I was playing in a Creative, Cheats allowed world in gamemode 0 in "Hard" mode
on the "Xisumas Dream Dungeon" Map by Xisumavoid.(Singleplayer)