Thanks for your question. Here's a workaround to reset your favorites and and re-import them from other browsers:
1. Go to edge:\\favorites 2. Select all favorites (Ctrl+A) & hit delete to remove all favorites 3. Manually import favorites from desired browser(s) via edge:\\settings\ImportData (under Import browser data)
I've filed a feedback (via smiley face) on your behalf to ensure we can continue to improve Edge favorites/sync experience. Thanks much!