After traveling a forum several buyers have experienced the same problems as me.
Apparently it depends on the "lot" of films.
We must check the ASIN number in the product details before ordering:
- B00E7VFEF4 >>> badly cut films
- B00E7VFFJY >>> no worries
Well, that's a shame because the setting up of these films do not pose particular concerns and the quality is correct.