STB, I use Elmers multi purpose mounting spray, it is a repositionable glue. I have never had any problems with it, unless it was user error. Sometimes I'm a little over generous with the spray button, and the pattern sticks to well. For those instances, I use mineral spirits to soak the paper and excess glue to wipe it off. In your picture, it looks as if you haven't used enough glue. If your not familiar with the spray glue that can happen, but, once you get used to using it, your problem will be solved. There is quite a difference in spray glue types, some of it is to be used to permanently attach one item to another. Repositionable spray, is used so that you can remove one item from another with not much diffculty. If you use the repositionable type, it can take a bit of getting used to how much is enough. It's a trial and error type of thing. Once you get used to using it, you'll wonder how you ever survived without it.
Len