GET Request not shown

Hi There,

I have the following problem; the response of a GET request is not shown in the browser.

What do I want to achieve;
I have a projects (custom post type) overview page, where by default I display all projects with pagination. There are 3 types of project, the type of the project is a custom value (which is more convenient for the rest of the project). I want to let the visitor also view one specific type of projects. Visitors can do this by clicking on a button for the specific category. The project overview page is a custom template page, http://localhost/bdf/projecten-overzicht/. With a button I fire a get request to ; http://localhost/bdf/projecten-overzicht?categorie=ONDERWIJS.

Before adding “remove_action(‘template_redirect’, ‘redirect_canonical’);” to functions.php I got 2 responses the first a 301 and the second a 200. If I go to the Network tab (Chrome) and look at the preview, I see the page I want, the projects for that specific category with pagination. But the page is not displayed. With adding the “remove_action” to functions.php I only get the 200 response but still the response isn’t displayed, it still shows the original page with all types of projects.

So I’m a bit stuck here, can someone point me in the right direction?

This is the header

Kind regards,
Sander