On my notifications and autoresponder e-mails, the 'Hide Empty Fields' is not working properly.

Have you changed the label name of some of your fields?

Please note that when this option is enabled, you should use the default data table in your email notification and autoresponder email for the "Hide Empty Fields" feature to work. You can still add some text and new rows but you should keep the labels and fields tags of the questions intact. If you delete the whole data table then create your own layout, then the hide empty field feature will not work.

Guide: How to Hide Empty Fields on Email Alerts