multi-checkbox not working as expected

multi-checkbox behaves oddly when set as a required field.

I created a very simple multi-checkbox asking users whether they wish to receive our e-newsletter. There were two options, yes and no. I set it as a required field and in the advanced tab set a minimum of 1 selected value and a maximum of 1 selected value. However, the validation will only let me submit the form if I check both values.

Is this a bug, or have I misunderstood how multi-checkbox is supposed to work?

The page I need help with: [log in to see the link]

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Your Advertisement Here