What version of Firefox are you using? How many items are actually on your toolbar and should appear? Do you know how to check the Browser Console for errors that might be relevant to this?

Edit: It would be much easier if you used my website to contact me. But what you describe is normal. There is currently no way for extensions to interact with live bookmarks like the "Most Visited" folder, so there is no point in showing it, as I can't get the contents.