I use the Firefox browser on my Mac Mini and my HP laptop, and use the Firefox bookmarks sync to keep them synced. But Firefox refuses to create a iOS version of their browser, so I use Safari on my iOS devices. I imported my Firefox bookmarks into Safari one time, but I don't sync them to Safari as I cannot find a way to do that. If you are syncing Chrome bookmarks to Safari, then I can see where there might be a snafu occurring somewhere, perhaps with the Keychain option if you use it.