I have a new oval above ground pool. I put it up myself and when I put water in it the bottom of the pool starts to lift. Does anyone know why this happened and how I fix it?

It sounds like when you installed it you
Did not suck all the air out from behind
Your liner with a shop vac.

Blair

Did you already attach the clips that hold the liner up and over the wall? If so remove them, this will allow the trapped air to escape. A shop vac is not necessary if you do this but it may help.