I don't know why the bolts are different, but my rear outside bolt is TORX and the rest are hex heads...
As to the reclining, there's a lever to release the recline mechanism to allow the seat to slide and fold forward for easier entry to the back sest. If this jams, it can cause this result. When that mechanism works right, it allows the seat to be pushed back into position and automatically reclined to the same position it was in, but only if you push the bottom of the seat back, not the backrest...
It's not a common problem, though.