Sometimes I'm having some voting errors too. But mine's different and I think it's not that serious. Anyways, have you tried what TPC said, clearing cookies/cache? Or maybe, just maybe, repairing you I.P. address? If nothing worked, maybe try sending a Support Ticket to the GMs about this. That is, if you haven't already.
My IGNs: Micheru~is a full support priest, base 83 and job 50. Micheru Nyaaniniwill soon become a merchant, base 30 and job 10.
(This post was last modified: 06-09-2010, 12:55 AM by Micheru~.)
Some people who had the same problem said just refreshing helped and clicking Vote For Point from the left menu. I know you tried it and it didn't work, at this point I'm not sure what the problem could be since it works on your desktop and on most people's computer. Perhaps upgrade your firefox version, can't hurt.