Your voting buttons are in dropdowns?

No, I never said that. I mentioned voting button selection getting changed when I try to scroll as an example of attempts to navigate being thwarted by form input elements (and I've heard lots of people complain about that specific case). And I said drop-downs take over (almost?) all forms of scrolling via keyboard (I fail to find any that still work but I won't claim to know all of the possibilities).

I was mistaken about scroll wheel changing drop-downs here now (much of the time I don't have a mouse wheel, including when I replied and had to resort to memory of the scroll wheel changing a selection, a memory that I still have despite not reproducing it here now).

Hm. I can imagine keyboard navigation getting messed up... but I don't use keyboard navigation, and (using mouse) I have zero problems with form elements.

If other people are reporting these problems, then probably they're well known. Have you searched? Is the consensus that they're browser bugs? What browsers do you use? I'm using Chrome. No problems. Never had any problems in Mozilla products either. Maybe I'm not grokking the failure scenario. What steps can I take to trigger the phenomenon?

Well, I don't know what more I can do, given the (little) diagnostic info you've provided. I know you don't need my help; I'm just curious.