Definitely strange. Can you feel the film?
Kind of looks like a hard water film or it may have been exposed to something for a long period of time that may have etched the glass.?
What's the history on the car ?
Did you just buy it ?
Sorry for all the questions but information is helpful to solve an problem

Several tips on Google
how to clean cloudy glass windows

Another that may not be listed was to soak a towel in white vinegar, place it on the window, cover the towel with something like saran wrap, seal most of it (tape?) to limit the evaporation and leave it overnight.
or try calling GORDON GLASS COMAPNY LINK