Not sure if I have a problem or not.. My liner seems to be connected on the left and right sides of the top, but not anywhere else. I do have some sagging, like JD, in the middle. I've also noticed that it bunches up when I roll the top. I roll from both sides, left halfway, right halfway, liner on the inside. It's like squeezing a ketchup packet, and the loose part of the liner gets pushed to middle.
You guys with the fixes, is the liner completely attached to the top? Or should it be just connected on the sides?