I noticed that fairly often when I vote for a novel on my phone hitting hitting vote once will use all three. Never had it happen when I use my laptop yet. I use Firefox on both devices with the same addons on both. Android on my cellphone through t-mobile, if that helps narrow down the mobile build, however as a layman to these technical details I'm guessing it's a problem with the 'mobile' version of the website. I'll try to 'request desktop site' option on the phone browser from now on and in a week or two come back and let you know if the problem persists. And no, it's not me accidentally hitting vote on other novels while scrolling on my phone. Aside from me being extra careful not to do that after first noticing the bug, I tested it recently by voting King's Avatar and the vote counter from straight from 3 to 0, but naturally the counter on the novel only increased by 1.