Hi Travis, Check the sharing on the request queues that user can't see and also compare their access level and user settings to another user that can see all of the requests (who isn't a System Admin). Then you can change the sharing on the different request queues or adjust that user's access level and/or their user settings. This is how we control the access on our different request queues as a way to secure them.
Regards! Sheri Sheri Whitten