Found *3* loose screws while replacing lightning connector

Here's the story, chronologically:

1.) iPhone home button stopped working, noticed slight rattling sound when i shook my phone, sounded like something small bouncing around

2.)Some time later, speakers/headphone jack started working intermittently

3.)Phone started charging intermittantly

4.)Headphone jack, speakers no longer work. Headphones are only static/super distorted sound

5.)Only charges when off

6.)Only charges when off sometimes

7.)Doesn't charge ever

8.)I go to replace lightning connector, as I self diagnosed that as the problem from water damage since i dropped my phone in the snow

9.) I find 2 loose screws in the iPhone, just bouncing around

10.)No clue where they came from, can't see any empty screw holes that they should go in

I'm pretty stumped, this is why I'm reaching out to you guys

EDIT: I think I found where they came from, I forgot to check the screen earlier. Could any of these bouncing around have affected my charging/audio etc? I found a third screw on the back of the display. Images added.

EDIT 2: During step 42 of my repair guide, I went to remove a screw and there wasn't one there.

This is the guide I'm using