Took a short trip this afternoon and plugged our 2021 S into the Tesla Wall Connector when er arrived home. We have always kept the maximum set at 84% and it has worked just fine. Today as soon as I plugged it in the message on the screen said the charge was at 72% and it was stopping the charge since the set point had been reached. I reset it and it then charged to the set point (85%) and stopped. While I was sitting in the car trying to become more familiar with the computer it started charging again and went up to 87% before I readjusted the shut off point again. Any thoughts?