by Jon » 11 Jun 2008 19:17
Could be the seat is not engaged on the hooks on the top. There is about 1/4" to 1/2" sitting above the tray if memory serves correct.
A small bit of advice, install the bench first then fit the back. The bolt through the hoops can be installed using a socket with an extention. Push down on the bench foam in back to fit the tool.