Safari Favourites won't sync from iCloud

My Safari Favourite Bookmarks on iCloud won't sync in Safari on my iMac.

I tried to untick and re-tick Safari in System Preferences/iCloud, restarted Safari and the computer many times.

I also tried deleting bookmarks.plist file as well. however, none of these worked.

My Safari History and Frequently Visited do sync though.

All my software is up-to-date and my Favourites do sync in all other my devices.