Last modified: 2014-02-27 19:08:34 UTC
https://pl.wikipedia.org/w/index.php?title=Octan_etylu&curid=217010&diff=37144425&oldid=37144363 This may be a template that got subst'd in VisualEditor. It produces this text: <div class="do-not-make-smaller refsection references-column-count references-1column"> <references /> </div> Something sensible ought to be done with this, but I'm not sure what the right answer is. (Yes, that's in English, even though it's not an English-language project.)
That's the contents of the {{Przypisy}} template. It looks like they "spilled out". Parsoid issue?
I believe all these issues were fixed months ago (sorry for very slow triage).