Reply To: category filter does not work on one category

hello because site is live, please use the credentials below.
the filters that are not working are the “Στήλες” here https://test2.texkat.gr/product-category/%ce%b8%ce%b5%cf%81%ce%bc%ce%b1%ce%bd%cf%84%ce%b9%ce%ba%ce%b1-%cf%83%cf%89%ce%bc%ce%b1%cf%84%ce%b1/akan/
and the “Τοποθέτηση σε” here https://test2.texkat.gr/product-category/%ce%b7%ce%bb%ce%b9%ce%b1%ce%ba%ce%bf%ce%af-glass/ here https://test2.texkat.gr/product-category/%cf%83%cf%85%ce%bb%ce%bb%ce%ad%ce%ba%cf%84%ce%b5%cf%82/ and here https://test2.texkat.gr/product-category/%ce%b1%ce%bd%ce%bf%ce%be%ce%b5%ce%af%ce%b4%cf%89%cf%84%ce%bf%ce%b9-%ce%b7%ce%bb%ce%b9%ce%b1%ce%ba%ce%bf%ce%af/