My seat did that when it was new. The tabs wouldn't go into the seat. I had to make sure the tabs were in the holes in the seat before working the back latch down. After awhile it got easier.
2013 Sportsman 500 H.O. - Guru brush guard, 26" Big Horns, RDC 1/4" spacers, Viper Max 2500lb winch, EPI HD front springs
2011 Sportsman 500 H.O. - Guru brush guard, 26" Big Horns, RDC 1/4" spacers, gutted muffler, Polaris 2500, Polaris HD front springs, Polaris heated grips, Glacier III 60" plow, Quadovator reverse mod, 3 headlight mod, Polaris rear rack extender, rear L&R cargo box, HIDs SOLD
2011 Trail Boss - HIDs SOLD