Bizarre Problem with Signature!?

[76mm]

I've never had any problem with this forum; today when I left a post, I notice that there was a weird signature at the bottom of my post:
"[size=--Select Text Size--][size=--Select Text Size--][/size][/size]"

I tried going to my profile to delete it, and while I can delete, it reappears as soon as try to update my account... Any ideas?

EDIT: Although I noticed that the signature did not appear in this post..