Picture describing the problem can be seen below.
Issue : users can't scroll the page (vertically) properly as the mouse wheel is caught by the categories of items which do scroll horizontally
There will be another couple of categories below these so vertical scrolling is a must.
Been thinking about scrolling categories only when user clicks the control but clicking an item either opens a web page or a popup showing their content, so that won't work.
Do you know of an effective pattern to solve this usability issue ?