Hi Michelle,
I think I'm the only one here with a FantaSea pool so I might be able to help.
But I have a bunch of questions:
1) Are you seeing nails or screws? The walls are supposed to be screwed in, not nailed.
2) Are your walls 3/4" coated marine-grade plywood, or the aluminum and plastic "Space Age Walls"?
3) How old is your pool?
4) What size is it (dimensions, not gallons--they run from 12'x20' to 20'x40'), and do you have a deep end?
5) How extensive is the problem? Is it only in one place, or is it all over the pool?
6) How does the liner generally look? Is it cleanly in the coping or pulling out at all?
7) Did you install it yourselves, or did FantaSea send their team to do it for you?
8) Have you had any other mechanical/physical problems with the pool?
9) Have you spoken to Leisure Living/Pool Supplies Tech Support (They own FantaSea and Kayak pools)? Maybe this should be #1.

Depending on the answers, I have a variety of ideas from some fairly quick fixes to a more extensive project.

My pool is older and I'm in the midst of repairing winter damage that ripped most of my copings off! Liner is at the end of its life, but is custom because the pool is a custom size--16'x40' with a 5 1/2' deep end. So it's expensive to have them make a new one.