Style and content are not loading

Hey,
the problem is that I use the plugin “GP Nested Forms” and the styles do not load when I open the modal. But as soon as I submit a form, which is incorrect, it loads the styles and the content of the forms correctly.

Is there any fix I can use to make my forms load directly with the correct styles?
You are welcome to test it on my site.

I wrote to GP Nested Forms support and this was the answer:
You’ll want to reach out to the developers of Beauty Form Styler for Gravity Forms and see if they’re able to update their plugin to support the modal styling. GP Nested Forms is all working as we’d expect it to, so working with the other developer should produce the fastest resolution for you here

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