We have another bug for patch 10.1 as players have been reporting getting some very strange item levels for their Mythic+ Great Vault, but luckily it should just be a visual bug!
Some players’ Great Vaults are showing some very low item levels for their Mythic+ rewards, with the items being at their base level from the dungeon without the M+ part.
As you can see Bonemaw’s Big Toe defaulted to its 44 item level from the Normal dungeon, but players reported it’s just a display issue as there is no Season going on right now. Something similar also happened at the start of Season 1. So in case you run into this issue, you probably shouldn’t worry, at it looks like it’s only a visual issue and once you choose your item it will be the correct item level.