One month post op BA.Do I have a malposition deformity? Anything I can do to prevent it from getting worse?

It does not appear that you have an issue with implant position, however it would be easier to tell with an exam. The implants need to be positioned behind the nipple/areola to make the breast look aesthetically pleasing, so preoperative great asymmetry can lead to this as well. I recommend you return to your plastic surgeon to confirm everything is ok.