Hello,
JA Multilingual component just create multilingual content as normal way you create content manually but it just do it automatically.
So, I don’t think it is a cause of this issue, please ensure that you have enabled language filter plugin.
Please read our document for more information
http://www.joomlart.com/documentation/joomla-component/ja-multilingual#enable-module
If you have followed all steps in our documentation and this issue is still persist, please send me PM for your site administrator account for further checking, so I can give you more help to resolve this issue.