UPDATE: This is now resolved
You've probably noticed (if you are an Xbox One player) that the achievement GS and TA have been zero'd for all Xbox One games.
This was a bug in some new scanner code that just went live - I'm just going through and rescanning those games now. We'll then need to recalculate the TA scores and then update everyone who got scanned in the 10 minutes before I worked out what had happened.
Hopefully everything should be fixed within an hour or two, the scanners are off in the mean time...
Apologies for the inconvenience!