Maybe the clips on the seat are messed up?. The back is usually pretty rigid. Just another place to look.
Originally Posted by brock5ga
Push pins are still attached to the bottom of the seat. The top of the back is what is coming loose. Bottom pins are pushed all the way in.
2008 Space Gray Z4 3.0 si, Saddle Leather interior
2011 Nissan Frontier King Cab
2010 Lexus RX350