When Parsoid tries to have this transclusion expanded,

{{Top 25 report
  | January 6, 2013
  | September 8, 2013 | until | October 6, 2013
  | January 19, 2014
  | February 16, 2014
  | February 23, 2014
  | March 9, 2014
}}

there is a {{column-count|4}} that is left unexpanded in the result..

You can verify this via this https://en.wikipedia.org/w/api.php?action=expandtemplates&text={{Top%2025%20report|%20January%206,%202013|%20September%208,%202013%20|%20until%20|%20October%206,%202013|%20January%2019,%202014|%20February%2016,%202014|%20February%2023,%202014|%20March%209,%202014}}

It should have been expanded as part of the frame.expandTemplate call on line 81 of https://en.wikipedia.org/w/index.php?title=Module:Top_25_report&action=edit.
It is possible this is another manifestation of T270127.