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Duplicate URL Issues

Hi Folks,
Does anyone know why a few of out products are showing up as duplicate content when we run one of our performance tools:

https://www.fatpigeonwine.com/product/2017-monte-llano-tinto-rioja-ramon-bilbao

https://www.fatpigeonwine.com/product/2017-monte-llano-tinto-rioja-ramon-bilbao?c899336b_page=1

The difference is: c899336b_page=1

Any help much appreciated.

Ta