I lost my 2 max sets of enchanted diamond armor, max enchanted bow, max enchanted sword, Elytra, max enchanted fishing rod, and unbreaking III shield in arenas due to a glitch. Is there anyway I can get my stuff back or money to replace it?
Yes, ask a moderator in game and they can assist you. Unfortunately this has been a known bug for a long time, and I've tried to fix it multiple times with no luck. Sorry this happened.