OK, I guess I believe you since you say that's how it happened. It does just surprise me that:
A. You wouldn't notice that your charging handle is clunking against something when it's only halfway in and
B. The car wouldn't be showing any kind of warning light or message when it can't latch. I've had that orange warning light on my port and a reduced rate of 16 amps a couple of times when it is almost but not quite all the way in and can't get that latching pin to go in.