That is fine, if it stays where it is. I’ve had two glass tags in that location that both migrated about that same distance from the bone because of the shape that my thumb muscles assume when I’m forming a fist.
I would only be concerned if it’s right up against the bone. It will naturally move a few millimeters up the wound canal as it heals. You could assist it along by firmly pressing on your palm below the site to prop up the muscle, and lightly pushing on the rear of the xM1+ to move it towards the wound exit. Honestly I wouldn’t recommend it this soon after implantation, though. Just let it heal.