Are you able to check both of the sides with either a string or a long straight edge you might have around? If they are both bowed slightly then you have approximately a half inch deflection in each side correct?
I really don't have any hard numbers of what tolerances those pools are shipped with or what tolerances need to be maintained during installation but a half an inch in that short of a run would certainly be on the outside edge of my comfort zone. Perhaps
@jimmythegreek would have some better information in that department. You could also contact the pool manufacturer to get these specifications as well.