I noticed a couple days ago that one of my bookmark folders was out of order, which was odd, so I spent some time to reorganize it. When I was finished I thought that was the end of the problem. I was very wrong. The next day I noticed the same folder was pretty much in order, except for three bookmarks in the middle that belonged at the bottom of the folder. After I moved them, they didn't end up at the bottom of the folder, but instead, five bookmarks up from the bottom. I then tried moving the three bookmarks one by one. That was a mistake. Instead of ending up where I intended them to be, every time I moved one, it would end up in a space a couple of bookmarks away. I thought I could work around this problem, but over time this caused other bookmarks to get out of order, and pretty soon that folder became a complete mess and there was nothing I could do about it. Fearing the total collapse of order among my bookmarks and their respective folders, I really want to correct these rebellious bookmarks. Although, I don't know how to fix this and would really appreciate it if someone could tell/show me how.

Also, I heard that it may be Firefox Sync that was at fault so I disconnected it. When nothing changed, I uninstalled it. However, the problem still exists.