This is weird...
I noticed earlier today, on my 'Experience' page from my profile, some odd entries including something about a 'Helped me' bronze award and very high number of awarded points. I've attached a screenshot that I (fortunately) took at the time.
When I tried to go back to the Experience page, it does not even exist; there is no Experience tab. I logged out and back in, only to find that I now have zero points and zero level, and still no experience tab.