@Panther
Hold the phone, I just reproduced the behavior. And, it’s repeatable. The issue is that on my laptop, if I pull up a page while my browser is in windowed mode, the top menu bar, with the AandA.org logo and the page counter, flows over top of the line with the post location.
If I then put my browser in “full screen” mode, the post location line comes back (the menu bar isn’t smushed and doesn’t need to bunch up over the post location line). If I go to “full screen” mode and then back to “windowed” mode, the post location line stays put.
It’s probably an issue with the underlying software, but at least I know what’s going on now.
Let’s see if we can get some pictures:
First picture, windowed mode in Firefox 67.0 on a laptop running Windows 7, no post location line

Second picture, full screen mode in Firefox, post location line

Third picture, return to windowed mode, post location line

The first picture, in windowed mode, without the "Home/Website/Forum Discussion / Adding post location … " line, that is what I’m now calling a bug.
I hope the pictures help explain things.
-Midnight_Reaper