Don't know how long this is happening but for some time now the Dutch foxycart receipts are a bit mixed up. The city of the buyer's address gets a number/code that's automatically added. Maybe a citycode or something. It's not something that is added by the buyer. Looks like a bug to me.
Not necessarily a bug but something that would make it a bit easier to handle afterwards is the placement of the number of the streetaddress. As it is now the number is shown on a new line, where it would be more appropriate to be shown after the name of the street. Is that something that can be fixed somewhere in the store-account settings?