I've been using paint masks for over a decade and a couple bodies ago I used one that left an awful mess like you had. And what a pain to get the glue residue off and not mess up the paint that I had put down already.
I think that mask had sat on amains shelves for way too long or something and the same thing was probably your issue as well.
I have never had an issue with jconcepts or prolines window masks. I think you got some old stock.

Rubbing alcohol will take it right off though and the windows are an easy area to work on.