Various forums are reporting few problems with the PS3's trophy & gamecard system. Several of the games that support trophies are not updating the gamecard with the trophy. I have had this problem my self with 'Buzz Quiz TV!'. My gamecard still shows a total of 19 trophies. When it should read a total of 24 trophies. Lets hope this problem will get sorted soon.
Let me know if you are having any of the mentioned problems.