1. Check your order and make sure all from same lot. That’s why we have the white board up there, put the darker strips along either corner. Board hides the color change. And adds interest. 
2. Overlap edges when installing. Product shrinks. Enlarge and look over the 12 on clock.
3. Get out your Elmer’s. About 6 months after installation, it started peeling off wall. Yes we had to stick and unstick about 3 times while installing. Maybe if you can do once and done, you’ll be ok.