By "charging cable" I would assume you mean a UMC.
Assuming 50A outlet, it sounds like the 14-50 adapter at the end of the cable has the wrong resistor in it.
16A is what you'd get with a 5-20 adapter. You didn't make an adapter and plug a 5-20 into a 14-50 outlet did you?
If wall connector, check dip switches.