Will not stay on

I agree the cellophane wrapper does not have to be removed as it is there for packaging reasons however...sometimes the cellophane can get stuck to the face of the shingle below!!! Which in turn is now covering the tar line which seals the shingles and will now prevent the shingle from sealing properly!!! I have had this happen to me personally but was obviously smart enough to remove it!!! So if in fact the cellophane strip remains on the back of the shingle it may stay and if it sticks to the face on the shingle ontop of the tarline it MUST be removed!!! Contractor should have known that so install defect he is responsible!!! Can any distributor of the product and they will tell you the same, and no i do not represent any manufacturer im just a 20yr roofer who knows what hes doing!!! Best of luck with that!!