Yes, your dish is C-band. The LNB downconverts it to L-band for the U4K which is why the apparent discrepancy.
From: Joel Force [mailto:email@example.com]
Sent: Friday, June 22, 2018 7:08 AM
To: CRTech <firstname.lastname@example.org>
Subject: FCC Dish Registration
Does anyone know if a 3.1 meter satellite dish, using Unity 4000, Moody Radio and Amb-OS satellite receivers, falls under the C-band registration requirement by the FCC?
I noticed in the Unity 4000 manual that it is considered an L-Band receiver.