The 'Supplies' report was not the correct report type. Make sure your custom report uses the 'Battle Station with Supplies' report type.

Im from Trailhead Help team, here to help you out regarding any issues related to your trailhead challenges or modules. Can you please let us the Trailhead Module name and unit name for which you are facing the issue. 

Regards, 

Ramu S. 

“++TrailheadHelpFollowUp”.