On my clients website (car salesman), there is an element where visitors are able to filter between purchasing or leasing cars, and filters around model, manufacturer, and so on. But if I, for an example, try to filter based on leasing and “Range Rover” nothing appears, even though I have a car in this category. If i only apply one filter, I am able to find the car in both cases.

The filtering options is made with elementor and the custom query function (backed op by code from the functions.php-file).

Does anyone know if this is a common error, or would anyone like to review the code in question? (sorry I am a newbie and totally new here)

I already tried making chatGPT review the code, and even though the troubleshooting gave me some interesting answers, the AI was not able to fix the code itself.