This sounds like a BMS problem. The car signals the charger the level of current it wants, and it seems to be getting that wrong, sending the wrong signal on the CP line. Apparently, the early BMS are rather unreliable, so you should get a replacement under the warranty.
If you want to look up the detail, https://en.wikipedia.org/wiki/SAE_J1772
. Although the article is for the Type One connector, the control protocol is the same for Type 2.