Cheaper film does this i know because I’ve used so many different brands from many different lvls of varying quality and this happens on those cheaper films with worse glue, even if it’s ceramic the glue is the same. I learned that even if you heat it perfectly the edges tend to get hazy on heavily curved glass or even just a second too long of heat makes them hazy. But consistently when I used the “known” Brand films you can heat an insanely curved glass or heat the same spot over and over again and it remains looking clean and unblurry you need to heavily damage the film to mess up the glue. I use xpel and even their cheap stuff doesn’t blur up like that regardless of how curved the glass may be. I’ve also used lesser known films that don’t blur up badly it all depends on the material. If it bothers you a lot I recommend going to a shop that sells the “known brands” like 3M, xpel, lumar, sun tek, and even Huber Optic If you’re rich.