This is one of those bugs where sometimes it shows as a red flag on MMB and is actually OK, and sometimes shows as a red flag and is not OK. And if you update online in MMB, the first save says "information complete", but the main MMB still shows red. So that leaves the user in total confusion. Now you could call up the Contact Centre and double check to see if it's OK their end, or you can leave it to airport check-in. Personally I would not call up, life is too short, but my Zen like approach to flying doesn't work for everyone. So long as you turn up say 90 minutes to departure at LHR then they can probably resolve this very quickly, if there is a problem. I wouldn't worry too much about it.