hello Jeremy,
You have to view again connection with a small interface. If You bought with, connection can be unsoldered. If without, that simply - check your soldering one more time. Sometimes, Chinese interfaces are just imitation. You can move your old interface into a new digitizer (I would do just that). That’s all about touch function. Home button - that pretty uncomplicated stuff: just two signals in one tape. Just check connection to the board (I assume you didn't break anything while disconnecting from the faulty digitizer).