I'm not clear about what the question is.
I think you might be speaking of an effect I have seen a few times. When clicking on the page, the page shifts up on the monitor but the action expected does not happen? I have seen this but have not investigated the cause.
My last thought was it might be a HTML problem, I tried to log out but it would not let me, so that trick now does not work it is like the site has a mind of it`s own, it is strange how it works some days and others it does not the same as it does with the reply buttons.
I have now updated to Firefox 17 I have not had any trouble for three days now so I think this update is compatible with the html5 as Firefox 17 scores high with html5 code.
The site was down the other day, it may have been updated.
I am using Google Chrome and the problem happens some times. This may be HTML problem of the site.