[SOLVED] OJS 3.1.1 - Citation plugin doesn't use publication year?

In my journal, the citation plugin is using (1) as the year, instead of the (2009) from the issue publication date. Any idea what might be going wrong? - http://linguamatica.perl-hackers.net

This is a upgrade from OJS 2.3.x

Curious some articles are correct: http://linguamatica.perl-hackers.net/index.php/linguamatica/article/view/8
Some others have problems: http://linguamatica.perl-hackers.net/index.php/linguamatica/article/view/18

Found that I can change it. Still no idea why some have other not, but fixing the wrong data.