What it sounds like is that you are not using a Tesla Mobile Connector (the thing that plugs into a socket on the wall and is usually mistakenly called a "charger"), nor a Tesla Wall Connector (mounted permanently on the wall and not plugged into an outlet), but some kind of third-party charging equipment (typically called an EVSE).
As outlined above by others, a photo would help immensely. Show us the outlet (with nothing plugged into it) so that the "holes" are visible (so we can determine what type of outlet it is, and therefore, confirm what the maximum amps you can get out of it), the EVSE, and any intermediate cabling.
I believe that it is normal that the car reverts back to showing 48A when charging is interrupted. Usually after the successful completion of a charging session, the car will remember what the maximum current is for that location. I don't charge at home myself, but that's what I recall reading here.