I HAVE purchased the game MOTORSTORM RC ON my VITA. I have earned like 20 trophies on my VITA. Then when I installed the game on my PS3, I immediately unlocked all those 20 trophies on my PS3 without even playing a single race. Then I earned the 21st trophy on my PS3 n synched them. When I again played the game on my VITA i didn't get it. Then I have been playing on my VITA n unlocked the Platinum.But when I again played the ps3 version i didn't get them again. Isn't it stupid? Why didn't it unlock as it did the 1st time.

Am i doing anything wrong here. Will deleting the game and reinstalling it on the ps3 grant me all the trophies i earned on the vita?