Favorites bar in Safari is not saving
I recently updated flash on my MacBook Pro. Ever since, I am not able to save pages to my favorites folder in Safari. I have tried adding bookmarks in all the ways possible, ie, adding with the plus sign, adding with the drop down window, and even dragging folders into the favorites file. They will appear for a few seconds then disappear. Plus all of the bookmarks that were there previously are gone.
All of the other bookmarks folders and the contents haven't been affected. I have done all of the recommended troubleshooting. It is not a syncing problem, nothing on my phone or iPad has changed.
I don't know if it the flash update, but everything was fine before.
Thank you
MacBook Pro early 2013 running OS10.13.6