I have changed the line:
if ( !empty($post) && has_shortcode( $post->post_content, ‘my_acf_user_form’ ) ) {
for this other:
if ( !empty($_POST) && $_POST[“_acf_screen”] == “acf_form” ) {
and now it seems it works!
oh… 🙁
thanks for your answer @pr0fess0r. i will keep investigating!
<3
Same problem here. Did you find the solution @pr0fess0r? thank you in advance 🙂