Problem combining Theme my login and ACF plugins

I have two two more custom pages that have acf_form() function working and also they save the values.

I am using latest v4.

But for the user profile and registration, the saving does not work.
The user can register and update default user fields. Through acf_form() the fields group from advanced custom fields gets displayed and also when editing profile the right values are in the input fields.
When I check the console I get the following error:

ReferenceError: acf is not defined

and when I look at the source code the input.min.js script is not loaded as it should.

I have customized profile-form.php and register-form.php in my theme directory.
The problem is with saving/updating those advanced custom fields, nothing is saved.
So I don’t know exactly where to look for a fix?

What can I do to get more info on this matter?

I have much more to learn about inner workings of WP, so any help would be appreciated.

Thanks.

https://www.ads-software.com/plugins/advanced-custom-fields/