Looks great! But I'm worried about the pin backs not attached very well

The actual acrylic artwork part came out great & none of my pins were damaged during shipping like what happened to others, but today the acrylic part of the one my mom had on her bag had come clean off. We think it was kicked really hard by the toddler she was carrying, because it had lasted a good few days outside on her bag, but we took a closer look at the other ones and it wasn't hard to nudge the acrylic part off by hand. The ones I already sold haven't made it to my customers yet but I'm really hoping they won't have this problem.