Several odd issues after attempting my first repair (iPhone 11 Pro)

I am trying to repair an 11 pro. After replacing the battery, screen, and wireless charging coil, I have found some weird issues. I am thinking they may be software issues for a few reasons, but I have completely reset the phone with no luck.

-Both the front and rear cameras seem to freeze in the camera app. The image from the camera shows for a second, then the picture freezes and I cannot take a picture. However, there is an image, and the face ID works perfectly fine, which is odd. I will attach a screen recording to better explain what I mean. Perhaps a software issue.

-I cannot get sound of any kind through either speaker, and it did work before the repair.

-The volume buttons do not work to adjust the volume, but do work for turning the phone on/off and going into recovery mode. The silent mode on/off switch works. Thinking this could also be a software issue.

With the naked eye, I do not see any damage in the flex cables. What is going on here? This is my first time ever attempting a phone repair, but I cannot figure out the problem.