Theme creating thousands of duplicate sites

Hi, we aquired a client recently and encountered a very strange issue - the client's website is creating literally thousands (crawling by Screaming Frog SEO Spider, currently 140 thousand and counting) duplicate sites.

The website is https://prowiss.sk/

The sites URLs look like this https://prowiss.sk/renovacia-zrubov-drevenic-drevodomov/repas-drevenica-kalameny/nggallery/-wordpress-theme/7758048/-wordpress-theme/7758048/page/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/-wordpress-theme/7758048?ref=muffingroup

Do you know what could be the issue here? Thank you.

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