Hi,
I know it’s late for this but just in case… The problem comes form this function themnific_add_javascript
defined in respo/functions/widgets/theme-scripts.php
file. In this function get_stylesheet_directory_uri
gives the child theme folder instead of the parent theme folder like get_template_directory_uri
does.
So to fix this just overwrite the function themnific_add_javascript
in a functions.php
file in your child theme folder and change every get_stylesheet_directory_uri
by get_template_directory_uri
and you’re done…
Alternate solution is to copy js files in your child theme folder.
Hope this helps