After a few months that I revisited this part of my site , I realized that the horizontal bar of letters stopped working, the alphabet letters are no more clickable (chrome and firefox).
1.Try save and Publish for twice
2. Open in New tab or Incognito Tab (May be Hard Reload Helps)
3. Make Sure you are logged in With Admin credential in Published Site
4. Check Database Permissions
If you go into Chrome and then debug it you’ll see a bunch of errors happening on the on-click. Its a bit too geeky for me to understand it, but its not right. I’ve often wondered what happens when one re-publishes a site? Does that help? My mouse changes to a hand when I hover over the letters, so it is expecting something.