Is your site in a subdir? Like ‘mysite.com/subdir/’
I dont know if thats your problem but.
I know there is a bug in ACF Pro that the redirect url after posting the ACF Form becomes like: ‘mysite.comsubdir’.
I’ve reported that bug serveral months ago but dont think its fixed yet. Everytime ACF updates i have to go in the file api/api-helpers.php in the plugin and change the function acf_get_current_url() ..
And change the line: $url = substr_replace($url, ”, $pos, $length);
To: $url = substr_replace($url, ‘/’, $pos, $length);
