Originally Posted by Tetsujin
No, this is due to your PS3 being a new one. The trophy data isn't carried over to new PS3 system so when you start a game, the trophies will be back to 0%...until you sync with the server, which restores the trophy data.
Not quite. the trophies have been synched already dozens of times. I had 65% locally in DS. After the first trophy it went back to 1%. But other people wrote that they had the same issue and the resynch worked correctly. Well, let's hope so. It should be a matter of a couple of days to check.
Thank everyone for answering.