I have noticed recently that these have become unreliable and often giving out wrong information. I am on the Hounslow loop heading for Waterloo and the train describer is showing all stations to Reading. What has gone wrong ?
Nothing has gone wrong, that's behaviour inherited from South West trains who regularly had their announcements back to front/ out of sync with the journey. Look on it as a charming little quirk.
Someone typed in the wrong code for the CIS system?
Or was it shown wrongly on the train crew schedule cards??