On https://steemproposals.com/proposal/33 you can click on supporters and see the votes plus the amount of proxy they add to their vote. From what I've been told this indeed comes from the witness proxies some people have set up.
Thanks, I stand corrected.
However, if the proxy-following account then also votes, it looks like it gets counted twice, at least looking at the numbers.
is this a bug?
Good question, I have no idea, maybe you can illustrate here where you see this happen and we can try to identify the problem - if there is one.
Thanks, @steemchiller's latest post is largely about this issue, and SPS voting in general. :-)