I flew today from KSNA (John Wayne-Orange County Airport), and I noticed that the runway numbers are wrong. In the flight planner the options are runways 19 and 1, but the runways are painted 20 and 2.
This is the same on iPad but at Oakland KOAK runway 12-30 that is displayed 11-29 in the flight planner.
It must be a question of rounded angles.
It's due to the magnetic fields changing. The runway numbers are different to the navigation data that we have because they were created at a different time and the real world runway numbers had already changed by then.