I also am having this same problem. I removed my facebook account once, but when re-syncing it none of the facebook e-mail contacts sync'd up correctly. Did the same thing over again last night and everything went back to normal, but this morning I had multiple facebook profiles for each contact again.
This has happened to me, all i do is must select "use this profile as default" and then hit one of them. It never brings up that screen again, and hitting the little "F" icon for facebook when you tap the persons picture automatically brings you to there facebook wall without having to choose which profile to view.