Duplicate tabs in menu

My app’s URL: vdl-insiders.glideapp.io

As described in the Insiders course announcement thread, i have followed the 8-part video series to the end and rebuilt the app successfully, except for one rather vexing behaviour that looks like a bug to me: the menu seems to be sprouting duplicate copies of certain tabs (About and Resources) for reasons i don’t really understand, but i suspect it has something to do with visibility conditions, as those are two pages that relate to admin-only functions (i.e. approval of submitted Resources… and the About sheet is the one i based the Admin tab on, if that makes sense).