The issue has been fixed now. You should be able to level up as usual. Since you weren't able to unlock level 6 before unlocking level 5 you shouldn't have lost any items / other rewards. Sorry for the inconvenience!

The issue has been fixed now. You should be able to level up as usual. Since you weren't able to unlock level 6 before unlocking level 5 you shouldn't have lost any items / other rewards. Sorry for the inconvenience!