Hi @tabboy
Thanks for the .json attachment. I’ve imported your field group and and tested your conditional logic which worked perfectly as expected for both adding a post and editing one.
It may be possible that your post edit page contains some JS which is conflicting with and preventing ACF from running.
Are you able to setup a blank WP site and import your .json to do some testing. Perhaps you will be able to find the culprit by adding in your plugins / theme one at a time
