You're not alone... sometimes there are new opinions or comments and the notification is missing... and sometimes you get fake notifications :o I've had it and many others have mentioned the same issue!
Ah! Those are really annoying! They're usually alerts for posts that have been hidden by moderators and are waiting for admins to review them. If they don't go away in like a day, I'd message the admins at http://www.girlsaskguys.com/contact and let them know what's going on.