Woocommerce – various number of products per row

Hi,
I’m working on a web site for a client.
http://www.transproject.pl/testowa/produkty/

I have a serious problem with woocommerce.
As you can see in the first row displays the three products, but in the next one or two products.
Should be 3 products for each row.
What is the reason? I’ve tried everything and nothing.
I’ve tried this but did not work:
http://docs.woothemes.com/document/third-party-custom-theme-compatibility/
I’m using cmsmasters Industrial Theme
http://themes.cmsmasters.net/?theme=industrial

please help me