DA results page paging keeps adding more results

I noticed as I was paging through my results page (created by DA) that the same record kept appearing at the top of the list, This made me investigate and I realised that more records were printing at the bottom of the repeat region of the table as I clicked further through the records, So I tested other results pages I had created using DA, and the same thing is happening.

Basically, on the first page I have the first 20 records returned. As I page through to the second page of results the suffix of '?pageNum_WADAtbl_product=2&totalRows_WADAtbl_product=158' is added to the url after the ,php and the second lot of results is returned as expected, but clicking through to the third page of results doesn't remove the previous (second) set of records. As I click through to the fourth page, both the second and third lot of records are kept and the list just keeps growing until I run of records. The last page has hundreds of rows returned. Have a look here:

http://brandchampion.co.uk/test_product_results.php This is straight out of DA, unedited.

http://brandchampion.co.uk/rental-furniture.php and this is the live version which I have edited, but it doing that same behaviour.

I've attached three pages in question.

Ordinarily, this works perfectly, so what's gone wrong?