I've recently moved away from Syncthing to Seafile to sync my files for a few reasons but the 1st reason was because it kept creating sync-conflits, even though the files hadn't changed.
Maybe that was an issue with my configs but I couldn't be bothered to go through setting everything back up so I moved to Seafile.
Here's a handy command to rename any files ending with
rename 's/\.sync-conflict-[0-9]*-[0-9]*-[azA-Z0-9]*//' **
If you're on Ubuntu, you'll need to install the rename command first:
sudo apt install -y rename
Hope this helps anyone!