<p>I believe what is happening is they are summing all votes within the given period.  For example, in the <code>week</code> listing, the top three tags listed are the tags on which you had received the most total votes over the past week; in the <code>month</code> listing, you see the tags with the most total votes over that period, etc., up through <code>all</code>.  </p>

<p>On the other hand, on the <code>tags</code> tab on your userpage, the tags are listed in the order of upvotes for <em>answers</em> only.  Should a user not have any upvotes for answers, the tags on their userpage are ordered by number of posts with the tag.  It may be instructive to consider @Tim, who has asked many good questions, but does not really answer questions on the site.  His <a href="https://stats.stackexchange.com/users?page=3&amp;tab=reputation&amp;filter=all">listing</a> has degrees-of-freedom as the third tag (one question with 105 upvotes), but his <a href="https://stats.stackexchange.com/users/1005/tim?tab=tags&amp;sort=votes&amp;page=1">userpage</a> lists hypothesis-testing, time-series, mathematical-statistics as his top tags (all with no answers, but with 53, 38, and 31 questions respectively).  </p>
