Change number of columns on ‘sale items’ page?

Hi guys,

I am trying to get the items on my ‘sale items’ page to show up in all 4 columns, I think it may be something to do with the clear: both CSS but I am unsure what the proper way to go about fixing this is.

https://www.tlcbikes.com/sale-items/

As you can see the items only show up in two columns at the moment, any help would be great!

Mat.