I have a Wordpress site very customized where there are a lot of contributors and lots of posts are published. When you try to publish/update a custom post it displays a popup saying "The changes you made will be lost if you navigate away from this page. Are you sure you want to leave this page?".

This only happens when the modified/new content of the post is in custom fields corresponding to "Advanced Custom Fields" plugin. This popup is very annoying for the contributors. So I would like to know if is possible to disable this popup or any way to fix that.

Thanks.