pins falls off acrylic backing to easy

the button fronts all knocked off the pins after a bit of use, the pins should be glued onto the plastic backs , the double sided tape is weak way to do this acrylic side of things was a good graphic print , in my humble opinion the plastic was about 2x thicker than needed and made it look weird , like it was the glass from a hockey rink in an arena. i would order again if i knew the pins would be glued onto the plastic backs and used thinner plastic