Can't get products to line up in Category view

[HjörturGuð]

Hi guys,
I'm having same trouble getting my products to line up correctly in the category view.  It was like that when I started so the problem is not the template changes I've made...
Can you make any suggestions?
http://shop.lyfta.is/index.php/netverslun/brenderup-kerrur

[HjörturGuð]

Is there noone that can help me with this problem?