It's really hard for me to imagine that I had my clip like the picture on the left, but I guess it's possible. Would like to think I would have noticed that. Most of the time when I install them, the clip is already resting against the pin I pull it back slightly to enable me to insert it. Rarely, but sometimes, the hoop is all the way up. If I recall, it can stay in the all the way up/open position, so if I had a pin like that, I suppose I could have pushed it down in the wrong direction and not noticed that it wasn't laying flush.
Those pictures, along with Neil's, are helpful to make sure we don't screw up. Also, for what it's worth, on the Roadmaster with blue ox adapters, there isn't an arrow for up/down, like with the blue ox.