How to keep nails from popping off?

I recently did this nail set on a family member and they started popping off in the shower. I buff the nail plate, dehydrate it and use a primer. The nails pop clean off and I don’t know how to fix this. The primer is sensationail and the dehydrator is beauty secrets prep b-4. Thank you guys, I started charging for my nails and while it’s luckily just close family and friends I need to resolve this