Plugin does not work on every category

Hi there,

We are currently using your plugin which is really nice. We are facing some issues however with specific pages. For example the custom sorting on https://www.slimmeheater.nl/infrarood-verwarming/badkamer/ is working great. The same way of configuration for another category fails:
https://www.slimmeheater.nl/elektrische-verwarming/badkamer/

We are loading the products through the shortcode and have made sure the categoryIds/slug matches with the one we’re custom sorting. We also enabled the loop setting. What could this be?