Bookmark for this site disappears on Brave browser

Jupiter, Florida
Thread starter
So I have a "most visited" tab on my Brave browser, where I keep my favorite bookmarks. I organize them by alphabet and not by date added. Anyway, every so often, maybe once every two weeks, the "BITOG" bookmark simply disappears. This has happened about 10 times so far. Not sure what to think. Added it back today, let's see how long it lasts this time. No problem with the Opera browser. Virus?