looking at the number of ports available it would not surprise me if you did have two controllers.
Storage Interface
1 x M.2 connector (Socket 3, M key, type 2242/2260/2280/22110 SATA and PCIe x4*/x2 SSD support)
* Actual support may vary by CPU.
2 x SATA Express connectors
8 x SATA 6Gb/s connectors
Support for RAID 0, RAID 1, and RAID 10
* Refer to "1-8 Internal Connectors," for the installation notices for the M.2 and SATA connectors.
that series likes to dual everything up it seems