Mystery menu showing in archive-event.php

My custom post type archive template archive-event.php is displaying a menu that doesn’t exist. Then the links in the menu are to things that don’t seem to exist. It seems like a possible malware problem, but just checking in case this sounds familiar to anyone that sees this. The behavior persists when I remove the template from the theme and use whatever the plugin uses instead.

This page is showing a list of links that are different from the rest of the site those links return a 404. Stuff like:

There was also an empty ns directory sitting at the root level of the site. That showed a last edited date of a couple days ago. No one knows anything about that.

There used to be a different theme related events post type (with a different slug I believe) in the past. Not sure if that’s somehow connected to this or not.

I’ve tried disabling all other plugins and that doesn’t change anything.

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