CSS seems to block new 'featured' product rows

Hi There,

In my website i have a section for featured and recently added products. In theme options there is an option to specify the number of columns and products per column. I have selected 4 columns and 3 products per column. But still it will only show 1 row with 4 products:

http://www.hypotheekadviseurvergelijk.nl/

However, when you load the page for a second you will see all the other rows but then they dissapear. And in HTML I see all de Divs for other products, but somehow they are not showing in front end.

Also in HTML if i change the width of the wrapper to something like 748px, then I see some more products, but the rows are not completed.

<div class=”owl-wrapper” style=”width: 4488px; left: 0px; display: block;”>

Any ideas?