Popup / Out link not working correctly from tab section homepage

Hi all,

I hope someone can help me with the following problem:
When I click on reveal code on my homepage the results are inconsistent.

If the reveal code button is clicked within the product carousel in the top of the page the target page is opened in a new tab as expected. But when you click the title of the coupon the popup doesn’t show up and the website stops working after a semi transparent black layer shows up.

Additionally, in the tabbed section on the homepage when you click on reveal code nothing happens at all, and when you click on the title of the coupon it brings you to the homepage with a semi transparent black layer over it(I assume this is where the popup should be) and the url structure looks like this: https://voucheralarm.com/nl/?couponid=660#itemid660

How can I solve this problem? I would like the buttons to work consistently and I would like to be able to see the popup when/where it should show.

Also changing the coupon settings in general settings did not solve my popup problem.

My site url is:https://voucheralarm.com/nl/

I hope to hear from you soon!

Thanks in advance