Replaced screen, moved home button, but still cant use touch id

So I changed the screen on this iPhone and moved the home button in order to for touch ID to work. I remember initially doing this a while ago to the same phone and touch ID did indeed work. But now all of sudden I cant use Touch ID on this iPhone. The original home button is not damaged either, because I still have the original cracked screen and swapped it back to test to see if the home button is damaged. Surely enough, Touch ID worked on the cracked screen. Any suggestions on what to do?