B.B.
Question - are you putting the potty seat ON the toilet seat? We have an elongated toilet too, and I was putting the toilet lid and seat up and the potty seat was sliding all over the place. Then I put the toilet seat down and the potty seat on top of it, and didn't have any problems at all. The seat I bought was just a regular old Walmart one with Sesame Street characters on it, so it wasn't a specialized one at all.