If you could please post your twitter username as well as your socialthing username (note which is which please). We seem to have run into a rather elusive bug (has only happened on 6 out of 12000+). What's happened is that it authenticated correctly, it just didn't assign that particular Twitter account to your socialthing user account. Also note that it didn't assign it to the wrong person, either, so your privacy is maintained.

I'll take care of this as soon as I have your usernames.