I think the PCN might have been issued for the wrong contravention code, as the bay looks like a permit bay rather than a shared use or residents' bay. So the PCN should have been issued for 16 - Parked in a permit space or zone without a valid virtual permit or clearly displaying a valid physical permit where required.
The council can only enforce the contravention stated on the PCN, if that contravention did not occur the fact that some other type of contravention might have occurred is irrelevant.
I have ordered the traffic regulation order. Are you the owner of the vehicle and do you have the V5C? If so, is the address on the V5C up to date?
Also, can you please give us a google street view to the exact spot where you parked?