I’m not sure if this problem is in apa.csl or pandoc, but you’ll note that when you run the command below on the attached test file you get an in-text citation that is broken: it only provides the title of the first citation (“Communities”)—it needs both (and “Geek Feminism”).
<p>I have two citations <span class="citation">(“Communities,” 2011, 2013)</span>.</p>
> pandoc --filter pandoc-citeproc -s --csl=apa.csl test.md -o test.html
pandoc 1.15.0.4
pandoc-citeproc 0.7.2