I have trouble displaying the chosen articles

Hello there,
we are building up our new website on joomla and we want the user to make a multiple choice of tags and then display a featured image with a link to the original article.

I successfully installed your plugin and found out how to handle it so it appears in the frontend. (althought it only displays on one page, and I dont know why exactly, but i will find out, i guess)

But my actual Problem as followed:
I made a checkbox field, but when i click and apply the filter, i can not see any results... and i am unable to find out why it is so.. I think I am missing something... I would be very happy for some help!

page: 2019.form.ch/loesungen/8-projekte/16-ewb-gordonbennet
note: It is only a test-Website, please ignore the left part ect. Your plugin module is displayed on the right. please ignore the left site


EDIT: We are working with yootheme


Kind Regards from Switzerland,
Greg

Thank you for the response!

Okay, yes you're right it weas an article page. I created a category page but how will I fill it with content..? Shouldn't it just display all the articles within the category?
I'm thinking it might not work with yootheme.. do you have experiences with similar themes?

Thanks in advance for your help!