I kept my Black Diamond Ascension skins attached to the cheater sheet and rolled up, stored in their bag, on a shelf in my basement closet. Temperatures around 70 degrees F, for the entire summer and fall. When I went to use them, I found the glue on one of the skins had balled up and was coming off of the skin and sticking to the ski. But the other one was in perfect condition. Could this be a defect or storage error?