It's actually really easy to explain the differences.
1. As mentioned several times already, the reader feedback weighs the younger male votes much heavier than everyone else.
2. You can see the methodology and the demographic spread of the poll
here. As you can see, the majority of the respondents are in the 30's and 40's group.
(EDIT) 3. This poll was exclusively tallying the male respondents, even though there were more female respondents in their raw data.
This is why it will not match up perfectly with the rankings, because the two are weighed differently.