Your first link shows only a blank screen, but the second one is OK, and clearly a page of a Charge Certificate. This enforcement document is the 2nd stage of enforcement, of a postal PCN, and adds 50% onto the PCN penalty. If unpaid, the council can register the debt at the Traffic Enforcement Centre in Northampton, (TEC) (a form of county court, but with no courtrooms or judges). This adds £10 onto the debt, being the TEC registration fee. The council then send out an Order for Recovery.
So it is all about what stage you are at in the process, hence the need to see documents. It would also help if you post a list of all the PCNs with their date.