Hey there Digi, you seem to be up on all this.  T

Hey there Digi, you seem to be up on all this.  Tell me what you think the reason is that the front side of the certificates it designates them as series "C" and on the back side of the certificates they are designated as series "H" .  Any ideas why there would be this discrepancy?  It seems to me that the front and back should be the same.