Hi. I don't know if this is intended or not but when you join a tournament at the "Lannisport arena", there are two buildings or structures that are in the arena.
One is a temple-like structure at the middle that almost blocks the whole middle area leaving only one small passageway for competitors to pass through and the second one is just on the edge outside of the arena but still has parts of it inside it that causes some to spawn inside it making them unkillable unless you cheat.
I hope it isn't just me who gets this "bug?" and I'm sorry cause I can't put screenshots because I'm away from home right now and on a mobile.