My touch screen only works in certain places after teardown. why?

I opened my phone up, attempting to retrieve the home button assembly to clean in rubbing alcohol. I followed your teardown instructions to the word, cleaned the button, and followed the instructions backwards to re-assemble the phone. The back did not go on, still will not; I can't figure out why. turned the phone on, the button works better! hooray! Went to unlock the phone, and I cannot put in my pattern as the digitizer seems to only be registering touches in certain places. please help me! I need my phone. Will i have to order another digitizer for some reason?