[totaltec]

Jan,
Keep in mind that I am new to Bootstrap, there may be a better way to do this.

I see this code:

@media (min-width: 992px) {
  ul.products-grid.grid-list li.product-cell:nth-child(3n) + li.product-cell {
    clear: left;
  }
}

Which is some crazy-cool CSS in my opinion.

In the middle of the second line, see that bit: li.product-cell:nth-child(3n) ?

Try changing it to li.product-cell:nth-child(4n)