The last 3 days I have been charged incorrectly by TFL when using contactless at Forest Hill station. I have emailed them about this - because I often go to and from the station I am getting charged the maximium amount for each incomplete journey.
The issue seems to be with the card readers at Forest Hill station, which appear to work (and open for me) - but the entry and later exit is not registered correctly.
Has anyone else had this issue in the last few days? May be worth checking your journey history on the TFL site.