I suspect more a compatibility problem, especially since there's another user with what look like issues with an identical AMD board SATA controller and an Ironwolf drive, 12TB in that case.
I'm not suggesting you get new disks for now, just connect both parity drives to the HBA swapping other disks to the SATA controller, just not disk1 since it's the same model, connect for example disks 2 and 3 to the onboard SATA and both parity disks to the HBA in their place.