Probably you’re right and it has nothing to do with the_content filter.
I adopted that idea from similar posts of people having the same issue.
Problem is -although the form is being displayed- it just doesn’t works. But if the shortcode was placed in the default WYSIWYG WordPress editor it would.
In the example test page provided ( http://galo.prompt-dev.com ) the Jetpack form is being inserted via an ACF WYSIWYG field.
What could it be then?
