iPhone 7 Home button stops when front camera flex connected

Hi,

Strange question for you all. Purchased a phone that had a cracked screen and home button doesn’t work. Replaced the screen and all went well, however looking into this home button problem.. The home button doesn’t seem to work when the front camera flex is connected, and works fine when the front camera flex is disconnected.

Can’t see any torn cables or anything so i’m a little unsure as to what to try next! Any help or suggestions would be greatly appreciated.