For many versions of Lightroom, the sync settings keyboard shortcut (ctrl-shift-S) will randomly change exporting images. This first started many versions ago and is still happening in Version 8.3. I'm running Windows 10 Pro.
Trashing preferences temporarily fixes the issue, but of course, I then have to spend hours/days rebuilding all of my preferences since Adobe still doesn't have a preferences backup.
Adobe Support has tried to fix this on numerous occasions but has yet to solve it.
Corporate photographer based in Calgary, Canada and Oviedo, Spain. Making portraits, architectural, industrial and advertising photography for national and global brands.