Does not fit in inventory, but inventory is empty

Logged in, went to arena, can’t pick up loot since wave 10. It says it does not fit in my inventory.
Now the Boss is dead and I can’t pick up anything even though my inventory is completly empty. When I use a portal to go back to end of time, the items won’t go away and there was an arena key in end of time i could pick up.

Player.log (603.2 KB)

https://imgur.com/a/VaNVVoH