columns in J2store

Hi

I use Helix ultima Framework for the site www.beestjesinnesten.be/webshop

I learned to use J2store with an old site, now i want to use it with this site.
Everythings workes, except the startpage of the webshop.
There is an option to set the number of columns in the product lay-out. For example 3.
But on the front-end, the columns apears beneath the filter-section. Only 2 columns work.

There was a piece of css

.j2store-products-row .j2store-single-product .j2store-product-images a img {
  width: 100%;
  border-radius: 5px 5px 0px 0px;
}

I removed this an now i can make 3 columns.

But for example 4 columns do not work.

I used J2store on another site joomla 3.10 and template manufactur
https://papierschepperij.be/webshop
There, i can play with the columns without any issues...

Anyone who can help me pinpoint the problem?