The Amazon stuff is almost certainly fake.
3M products are up there with the most copied things here in China and it is a real battle for me getting a good quality tape like this.
The copy stuff looks EXACTLY like the original. They copy dozens of different 3M tapes.
Some copies are very good and work well, others, not so much!!!
My advice is buy from a reputable seller (such as Pin Restore) and stay well away from AliBaba (and the 40 thieves) and similar online shysters.