Anyone ever have a gamerscore glitch for TWD???

edited May 2013 in Game Support
I had an odd one, basicly i had ALL the achivments for TWD the game, all the little icon pics, but not the full gamerscore, it only showed 30/40 and 400g out of 500g, this went on for many many months, i tried replaying the whope game about 17 times and nothing, i recently started playing again for the hell of it and as i was doing episode 2 ( the episode when the bugg happend ) i stated getting the achivements for that episode again, and now its all good, why did it not work for like 9 months?
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