Today I even deleted all my bookmarks and turned off syncing on my iPhone and then reenabled it.
Try "resetting" both Macs and the iPhone.
On the Macs open System Preferences > iCloud. Deselect the box next to Bookmarks then reselect it then restart the Macs.
On the iPhone tap Settings > iCloud. Switch Bookmarks off then back on then reset the iPhone.
Hold the On/Off Sleep/Wake button and the Home button down at the same time for at least ten seconds, until the Apple logo appears.
FYI... don't delete your Bookmarks. That may make things worse.