Membership Plugin not protecting content, what's wrong?

I’ve created a “Visitor” access level, gone to negative rules, dragged pages in, and checked off this page

I’ve also setup the “Stranger” access level as “Visitor” in Options

I’ve saved, check to make sure the plugin and access level are active, and this page, when checked from multiple devices, is clearly not protected.

Is Membership a buggy plugin? Why would this NOT work, and the page still be accessible?