There may be some confusion with the Show Other Sites feature appearing at the bottom of the Resources page. This feature is defined by individual user, not role, but that is not clear from the interface. When they look at the page in student view, they get the impression that students will be able to see content in their sites.
1) Change label from "Show other sites" to "Show your other sites" (or maybe "Copy content from your other sites" if we implement #4)
2) Add text above list of sites (when list is expanded) to explain that the list belongs to the individual user.
3) Hide this feature for students and guests.
4) Allow only the Copy action to work for any folder/item selected in the other sites list (to prevent accidental deletion).