I need help. I recently bought 2 safety 1st carseats for my 2 year old and 11 month old. Exact ones. I have read the manual and cant seem to figure out why my daughter's which has the little lever lifted to make hers not as reclined, keeps sliding on the seat and she looks like she's laying down. We havent used it but a couple of times because I have no idea how to prevent it or what/ if im doing something wrong.