Protected Content plugin settings, cannot change membership site pages

I'm trying to change the page that non-members see when they try to select protected content. I've tried changing the "Select Protected Content Page" option from "/protected-content/" to a custom page that I built. But the formatting is all wrong - it's picking the text from my "custom" page, but then oddly adds a list of pages from site (see screenshots).

and the URL still shows "" rather than "[mycustompage]". Any advice?