Yes, this is perfectly normal.

The first time you see your clear bra/paint protection film if you have polarized sunglasses lenses, it might concern you, but it is nothing to be concerned about. What you are seeing we cannot explain how or why it shows, but it’s normal across the industry. 

All films must be heated or stretched in some way, and this shows as odd discolored distortions when wearing polarized sunglasses lenses. 

Do not be alarmed!