The EMA docs that leaked in summer 2020 had concerns about the novel lipids used in the Pfizer and AZ shots. They're processed in the liver once their payload mRNA is delivered. Animal studies showed severe hepatic reactions in some tests.
If I recall, at least 1, if not 2 of the 4 lipid molecules used in these shots had never been used in humans before.
2 thoughts based on this description.
Check surround sound settings. Right click Speaker in taskbar, choose Sounds. Click the Playback tab. Click properties button for current speakers. Check the Levels tab and Enhancements tab settings for any channel issues. What you describe is what tends to happen when center channel settings are wrong.
Other, less likely thought is audio/video codec problems. Windows 10 should have all the ones you need for common media, but some other program may have over-written some of the native windows software. A little harder to fix than a forum post, but you can google "fixing windows 10 audio codec problems" to help get proper instructions.
Good luck, audio problems can be the worst. One last thought... unplug any headphones that have their own audio controls and see if it is still happening.
It appears to be unmodified using any manual methods. All of the usual JPEG markers are there, and nothing is appended to the end.
This doesn't mean there isn't something encoded inside the file using more sophisticated means, but without knowing the program or method used, it would be impossible to spot with the naked eye.
I will also add that to move, set, adjust, or dial in pendulum accuracy absolutely does not require this level of disassembly.