Of course you are right, it is a very old site. But that is also kind of the reason why I am not willing to change it. First the owner of the site does not want anything changed, and second, there are many old things edited in theme etc.
Wordpress is updated, all other plugins as well. Have not tried the deactivate everything and reactivate one by one yet…but will do
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users