DA - Response cards visible in the designer test environment but not in web widget

Summary

Response cards visible in the designer test environment but not in web widget

Content

Hi all,

Maybe someone can help me out here. I've created a skill which returns a set of cards.
The reponse works perfectly fine in the Digital Assistant UI designer test tool but when I test the same bot from within a web widget, the cards are not displaying at all.
Does anyone has any ideas what this could be?

Kind regards,
Luuk Schalk