Thanks for clarifying it.
When you hover over the names (if you're using a desktop browser), you see that their votes are actually worth 0, so in other words it's a display bug where when you hover at the end of any bar (it does it on the top voters too), it shows a 0 vote value for the most recent post if they didn't vote for it.
It must be a bug in the software library I used, so I'm not sure whether I'll be able to fix it.