anyone know why
Because you use it to much
@SMXLR8: I believe it's working fine, I just had a look at the flag queue and it was full of flagged spambots, which is probably the problem. If you have an issue on the forums that needs resolving and flagging the post inst working, send a moderator a PM instead. If it's about a thread in the Battles forum, you should probably PM Sonata about it, since he's basically the Battle mod.
It's because your karma is too high. That's one of the flaws with the flagging system. Even if your report is successfully processed and the person is banned, the system won't refund your karma points. It's actually faster to just pm a mod.