After proximity sensory cable change bottom of screen is buggy

My power button got stuck so I recently changed the Power and Sensore cable part with a new one - button fixed :)

However, whilst fixing one thing I have created 3 new issues.

1. Proximity sensory doesnt work (not a big issue I think the filter may have fallen off during repair)

2. Phone no longer vibrates

3. The most serious and weirdest: The bottom half an inch of the display does not respond to touch in certain conditions. For example, I cannot end a call - the end call button does not respond to me touching the screen. However the screen responds in the same area when I swipe to unlock or typing a message. In the settings menu, I cant press the bottom options in the list - screen just doesnt respond. The rest of the screen is fine

During the rebuild after the repair one screw would not go back in. I was very careful to ensure I didnt mix up screws. The screw is the 1.44mm one in Step 13 of the tutorial:

iPhone 4 Power & Sensor Cable Replacement

Also the 2.3mm red one seemed to not go in fully - as if it was too long or something. Very weird. Defo the right screw!

Any ideas