PLEASE!!!!! Remove the plastic film to reveal the tacky surface of the overgrip.
The stickers are only on the beginning or/and end of the overgrips back - this is how tennis overgrips are designed because otherwise removing it after use would be impossible.
However, Alien Pros C-Tac Overgrip will nicely stick on the handle because of its adhesive nature on its surface - it will stick to each other when you wrap them on the handle - make sure you pull harder when wrapping and have enough overlapping.