iPhone 7 home button clicking taps 3-4 times at once

Hello guys, I run a repair shop, where I several times hav replaces cracks iPhone 7 screen some of them work with the original home button and other not, they finger print still working but not the button some times, I am sitting right next are rose color iPhone which have this issue, I have run a DFU on it with iOS 10.3.3, and now the button is working but it taps more than 5-6 time at once push, what is the problem, I have tried 3-4 screen, stil same problem?