two's complement arithmetic gone wild

Social window, Friends tab selected, one friend highlighted in list, his info shown at right.

That info includes his name, which might be his actual name*
his character name, and
"Level -1,530,627,088 Demon Hunter"
with 3 buttons down below: Request Invite, Invite, Chat.

Int instead of Long? No, max level is 60. Reading wrong location in memory?

* no screenshot because I don't want to run afoul of the don't-post-personal-info rule