I did not go through every single post in the thread, however today I am seeing what onedrive is doing live.
I copied 2 files into the folder synced to onedrive. Less than one minutes after moving the file, it would get deleted by onedrive and appear in windows recycle bin. Restoring the file works but onedrive promptly deletes the file again. I have now restored the file from onedrive's recycle bin.
I believe this happened because both PCs that are syncing to the same folder are running at the same time. When I copy a file into a folder on PC 1, that file doesn't exist in PC 2, therefore onedrive deletes the file in PC 1. I will not be doing further testing, I am going to move to google drive ASAP.
This is scary stuff. I advice EVERYONE with a folder synced to onedrive to monitor their windows and onedrive recycle bin CONSTANTLY. This appears to happen after the latest windows 10 update.