Camera failure when I install screws

I placed the motherboard of my phone onto a new digitizer I got from ebay after breaking my glass and digitizer. It came complete. Only thing missing was the motherboard. So I used everything they sent me. After I put all the screws on the midframe, I noticed my main camera was failing. If I took out the screws and pulled back a bit on the glass from midframe it would work. As soon as I press on top of screen onto midframe or attached top screws, camera would fail. Anyone come across this. Something must be shorting out. I've taken it apart so many times but no idea.