Ha @noisy actually the tool gets all posts before the '2nd payout'-mark (I implemented 4 weeks / 28 days). If you go to your own blog https://steemit.com/@noisy you will see that you only have 1 post which still in the 4 weeks mark, all your other posts have votes removed because they are past the payout mark. Historical votes are not available on the blockchain somehow so the tool can't use them...
Because you have only 1 'eligible' post for the calculations, everybody who voted on that post is shown with 1 vote.
Is that a new thing? I could've sworn we had access to those a couple of weeks ago.