It's probably because someone quoted you or @NAMEHERE'd you in a private section, and because you have no perms, you can't see it.
but yeah delete all alerts works.
Suggestions
Alerts bug
Submitted by Repentance, 20-04-2015, 08:32 PM, Thread ID: 3091
Thread Closed
RE: Alerts bug 22-04-2015, 03:10 AM #3
22-04-2015, 03:10 AM
#3