Items Repeat

I have about 6 categories of items that are sold on my website.

When you click on one category you will get the first page of items for that category, all is good here.

On a few categories, when you click on the 2nd page, instead of showing the rest of the items under that category all I see is repeated items from page 1 ! I have lots of items that are missing.

The missing items only show up if I search for them by the specific item number. This is bad because new visitors don’t know the item numbers and can’t discover these items because they are not showing on 2nd and 3rd pages.

my website: http://www.cqbooths.com

Example of page 1: https://www.cqbooths.com/table-bases
Click on page 2 and you will see nothing but repeated items from page one.

This also happens on category called “Cabinets”

Thanks in advance!