It's not unknown for DVLA to be wrong..
I had this with my Clio 172, when log book came through it said it was a cup, it very much wasn't.
My insurer was aware of the discrepancy and said I was ok as long as I had it insured as the correct car.
It would appear that it was possible the car was sold from new by an independent not a Renault dealer and they had registered it incorrectly, this might be a similar issue although when I went to get it changed the Renault dealer in Carlisle said it was a cup also, salesman was a total buffoon. Got sorted in the end though.