Sub categorys are not all alinged

Sub categorys are not all alinged
see: www.virtuelshop.nl

The sub categorys of Ajax Feyenoord PSV and Barcelona are all left alinged.
But the sub categorys of the other categorys are not left alinged but horizontal.

So far i cant find how this is possible en where to correct this.

Thanks in advance

In which CSS file can i find these lines.

.hikashop_category_list_item, .hikashop_product_list_item {
float: left;

I looked in all the category files in the frond-end CSS files of my template but can't find it.