Ah, interesting observation. The difference is actually that the up arrows don't...

pmjordan on Jan 23, 2009 | parent | context | favorite | on: Ask HN: Does clicking voting arrows *sometimes* ta...

Ah, interesting observation. The difference is actually that the up arrows don't have an onclick attribute if you're not logged in, so you end up with the vote behaviour you normally get if you have JavaScript disabled.

maryrosecook on Jan 23, 2009 [–]

Ah, well spotted.