Infinite Scroll «post-load» trigger

I don’t get the «post-load» on categories page. Is there a way to catch this on categories pages as well? It works on the home page.

Link to home page:
http://new.infel.ch/

Link to category page:
http://new.infel.ch/category/arbeiten/

Thank’s for your help.
Phil

http://ww.wp.xz.cn/extend/plugins/jetpack/