Natix template causes problems

I use the natix template. This plugin is built in here, which is very nice.

However, no matter which domain name you enter, there is no result, it just keeps loading.

If I switch to another template, the plugin does work, so it is really in the natix template.

Example: https://www.webhostinghuis.nl/testpagina/

Same website, but now with a standard wordpress theme where it does work: https://server151.witxl.nl/~id2788044/site/testpagina/

I would like to hear tips on how to get it working on my website with natix template.

The page I need help with: [log in to see the link]