Store Catlog

Hi, 
for some reason, my products are shown in the store as one line with 4 columns 
I'm able to change the number of columns but unable to change the number of lines, so when you're looking to see more products the store loading them to the left of the current page.
I'm looking to change this so new products will be loaded on the bottom as a scroll and not to the left. 
I tried several plugins and code changes but nothing helped.
does anyone have any idea? 
I'm using the shopkeeper theme but test other themes as well they have the same [problem.

thanks

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