... or was it just your postcode?
The new open version of GB postcodes has some strange anomalies in it. There are nearly 1.7 million postcodes, but there are over 45,000 that have moved location since the November 2016 version. Most that have moved have moved less than 20 metres but 1,520 have moved 500m or more. There are 15 that have moved more than 10km, with the furthest moving over 62km.
The source of these open postcodes have changed, maybe the process that generates them has a problem in it. I'm going to look into this some more and try to get some information from Ordnance Survey too.
Maybe this is normal but it feels odd to me.