In some instances, certain toilet seat models may sit unevenly on the ClearRear™ causing them to rise or change angles. First, make sure that your toilet seat is positioned correctly and that your ClearRear™ is pushed all the way back to resolve this issue. If you noticed the two big rubber washers, you can also check if they are installed correctly under the bidet seat as they can also cause this unevenness. If after repositioning and checking the washers the issue still persists, we offer the Your Highness kit on getaclearrear.com, which includes small spacers for the underside of your toilet seat to resolve the problem. It takes about 5 minutes to set up and will solve any issues with unevenness!