Slide topper fabric wrinkles on one end

Ours does the same thing. We had a tech tighten the spring and although that helped, it didn't fix the problem completely. The fabric stretches on the end and we haven't found a way to fix it except replace the fabric. When we replace it, we will go with Sunbrella or similar fabric that lasts longer. If you have enough fabric one tech said you could remove the fabric, cut some off and restitch with better thread and stitching and then stretch it to fit the roller. Seems like a lot of work for little return.