Third party enhancements aren’t allowed within the Text Editor module. Most of these addons are only coded to work on the backend. When adding a GF shortcode, you can try visiting the native WP editor, where the GF button works fine. Use that, copy the shortcode it generates, then paste it to the Text Editor module on the builder.
I just checked the site and the first form looks fine. Is there something different with how you added the second form? We can take a look if you like. Just send over temp admin access to the site in question.