My email has me as someone I don't know on fB

I'm baffled.... The picture of "me" that shows up in the corner of my emails is someone I have never met before. When I got to preferences > accounts, only my accounts are listed. Yet somehow my email is bringing up the name and picture of some random facebook user. I do have facebook notifications forwarded to my account, however, the ones that are forwarded are all MY messages - not this other user. And, when I reply to posts from me account, they appear as me and not this other user. Should I be concerned? What's the fix for this?