i scratch built this seat a couple months back. 3/4 thick plywood, 5 in wirecut 2560 foam rave material both red and black. i glued the center panels to 1/4 thick sewfoam with weldwood landau adhesive. now i have wrinkles toward the back and i can't tell if it is the rave turning loose from the sew foam or between the sewfoam and the high density foam. the panels are not glued to the high density only stretched and stapled. what do you think is happening?