So, you’re photo is indisputably coming from Facebook, something the site couldn’t do unless you’d linked the account at some point. Look at the URL the photo’s being retrieved from in the HTML source. It’s possible you linked at one point and the photo URL’s simply being cached. But it’s DEFINITELY coming from FB, and unless you’d linked that at some point, the site wouldn’t have the URL to pull.
I’ve got a ton of work to get through today (mortgage bill came, so gotta get on it), so I’m not going to be able to dig into this for you today, but that’s what I can tell you right now. All I can probably do is offer to delete your account for you and let you re-create it. I don’t have the ability to change those social link/login settings, short of digging into the raw database, which I’m not going to have time to do in the short-term - sorry.