Circle/halo reflection on Crystal

Hi all. Is it normal for the acrylic crystal on the 40mm diver to show a yellow halo / circle in certain lighting?

If there is a circular light above me or sunlight shining in the car (some angles) it happens, in many other situations it doesn’t.

Also, is there protective film on the inside of the crystal? I took the outside one off.

I was wondering if that may be causing it or if that’s just how acrylic crystals work.

Thank you!