So, apparently the Leveling event is quite bugged.
Came to my attention that me and many, many people on the server have the issue with collecting items from mails above lvl 10.
There was no issue collectin the lvl1 mail with costume and weapon skin. However, at lvl 10 I wasnt able to collect the wings, helmet and Atlas due to "Theres not enough inventory space" and "Items cannot be currently collected" message. The thing is, I have got 70 free slots to fill in my inventory. The same case applies to lvl 20 rewards.
Any ETA when can we expect the fix?
