It's all the more strange that it happens at all. The actual request to the DVLA for RK details and the response are communicated using a secure Electronic Data Interchange. The request (VQ4) and the response (VQ5) are in a standard format. On receipt of the response the Enforcement Authorities PCN management system will auto populate the relevant fields for the case. This has been in place for donkey's years, so there's no real opportunity for the address to be wrongly transcribed. Unless there's manual human intervention.
The decryption software is not infallible. We've seen it for Lewisham, Westminster and Waltham Forest but all of those cases involved Marston, not Newlyn.