title: Django pagination is repeating results
body: <p>I have this weird pagination bug in Django: using <code>object_list</code> as a return of a view, but passing a &quot;paginate_by&quot; argument to it, it's repeating some of the results; Otherwise, if I remove the argument or set as <code>paginate_by=None</code>, the results are correct.</p>
  <p>If using pagination, the quantity of results is maintained at a total, so, because there are repeated results, the last results are left out of the list, so they don't appear in the template.</p>
  <p>Any ideas of what might be happening?</p>