Well, it is showing up here too and despite the fact that Firefox is faltering (on most of my machines nowadays) I doubt that it is a client side problem. (I think Firefox is having memory issues again
- it was supposed to be fixed some versions ago.)
Checking the page source finds no
such anchor, so it would appear to be some sort of "tracking" on the server side - since the anchor does not exist, the page renders at the top anyway and you are not supposed to notice it. The default setting for some browsers (mobile/ tablet in particular) does not even show URLs.
This probably explains for example, a page refresh returning to the top of the page.
Frankly, there are just so many bogus
things about this "forum" server software that you just become immured to it, obviously those maintaining it have made the (extremely poor) decision to use a crap piece of software and just have to stick to it as it would be just so tedious to "port" it to a proper system.
And all this not to mention the dread "token" foul-up which mostly irritates people but occasionally takes the system completely down.