there is a couple of things to look for , the first is the two pivot pins which are on the seat base could be cracked and bent and the second is when you press the seat release and flip the seat forward, there should be two round hard plastic stops and two rubber stops which line up with each other these are there to stop the seat laying back to far.
you can buy all these things at any of the sponsors on the right , the pivot pins as i call them are a bolt in repair item.
hope this helps
shane