I am facing the same issue. I created custom fields using ACF plugin and is also using CPTUI for creating custom post types. I tried solution given in this blog https://www.wpbeginner.com/wp-tutorials/how-to-fix-custom-fields-not-showing-in-wordpress/, but this is also not helping. The custom fields doesn’t show up n front end when updating the post. My website is rfpclub.com. I am just starting building this up and is stuck at this issue.
