Divi Custom project_category template not working

I need to pick your brains here.

I am using Understrap + Divi Builder.

I have created a special page template for the Divi Portfolio module which works perfect. I then created a taxonomy.php file for all the Project/Portfolio Categories. The mainpage (page-template.php) works perfectly but the moment I change to a project_category which is supposed to make use of the taxonomy.php file my template is broken. Upon inspecting the source code I see that my sourcecode now has the standard Divi html blocks

<div id="et-boc" class="et-boc"><div id="et_builder_outer_content" class="et_builder_outer_content">

Which I did not add into the template files.

Bear in mind that neither my page-template nor my taxonomy makes use of the page builder.

Any idea how to remove the above to fix my template?