I have two young children that spend a lot of time sitting and playing by the steps of our pool. I have noticed the liner under the steps on the floor of the pool has white patches, like the pattern is erased. The steps move a little as you get in and out. Is this going to cause problems? Is there something I can put between the steps and the liner to prevent this from happening?

(Reposting in different place...not sure if I'm right)