Products not 3 next to eachother showed after update

-- url of the page with the problem -- : www.temp1.p100.nl/
-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7.3
-- PHP version -- : 7
-- Browser(s) name and version -- : all
-- Error-message(debug-mod must be tuned on) -- : -

Since an update to Hikashop 3.1.1. the products are not 3 next to eachother like it was.

Old situation: kaakfahnen.de/ (=Hikashop 2.6.0)

Now: www.temp1.p100.nl/ (=Hikashop 3.1.1)