Captcha not working on Gravity multi-page-forms

Hi community,

I’m using this plugin for Friendly Captcha on my WP site together with Gravity Forms. When using the captcha in a simple single-page form, everything works fine. But when I try to integrate the captcha on the last page of a multi-page-form, it isn’t working anymore. This means, that there is only the surrounding border of the widget visible, but no content or captcha functionality.

Any ideas how this could be fixed?