<p>When sorting by votes, the accepted answer is promoted to the top, regardless of votes - <strong>unless</strong> it's a self-answer, in which case normal vote sort is used without promotion.</p>

<p>See also:</p>

<p><a href="http://blog.stackoverflow.com/2009/01/accept-your-own-answers/">http://blog.stackoverflow.com/2009/01/accept-your-own-answers/</a></p>

<blockquote>
  <p><strong>No change in sort order.</strong> Normally, accepted answers are “docked” under the question. This is not true for owner accepted answers; they stay in standard sort order like any other answer.</p>
</blockquote>

<p><a href="http://meta.stackexchange.com/a/212197/187228">Accepted Answer not on top</a></p>

<blockquote>
  <p>Accepted self-answers aren't pinned to the top.</p>
</blockquote>

<p><a href="http://meta.stackexchange.com/q/93212/187228">Self answer accepts should dock at the top, like any other post</a></p>