Hello,
Please find below some tips that might help here.
1.save bookmarks on each device (to be sure)
2.Reset Sync on machine 1 - secure://settings/resetSync
3.clean browser on machine 1 - delete bookmarks and everything
4.Turn on sync on machine 2 and then log in to machine 1
Our Sync is not real-time sync so if you are looking for immediate transfer on all bookmarks together, you will have to sing out and in again.