When sharing a folder between three devices using Syncthing, synchronization works correctly between two devices. However, after adding a third device, the original device starts reporting Folder Out of Sync and file conflicts.
Please include more information about the setup (type of devices, operating systems, etc.), including screenshots of the web GUI from all affected devices.
Problem Identified
The problem is solved. I had configured the Advanced Settings for all folders and enabled the options shown in the screenshot.
However, I later realized that these settings are intended for two-device synchronization, while I was trying to use them in a three-device sync setup.
So the issue was caused by my configuration, not by Syncthing itself. Everything is working correctly now. 
I can’t see the screenshot, could you attach it? I’m having issues too
