Was it configured with Software RAID. If so, that looks correct as the one on the left is probably the mirror drive (if RAID 1) and the one on the right is the one that will be used as data. I've never used OVH's setup routine (and when I hit my server it's via KVM to set it up so it's like sitting at an actual system).
But I'd wait on
@MattW to reply since he's set one of their servers up.