I had a breast reduction well over 3 months ago. I ended up having the (T-point break) which wasn't explained to me until after. This entire process has been mentally and physically draining. My issue is that my right breast is at LEAST 2 cup sizes bigger than the left. My surgeon and the PA are telling me that it's normal with the female anatomy to have two different breast sizes!
Little can be said without photos or exam.
You should be seen for a second opinion from a board certified plastic surgeon. It is unusual to have a two cup size difference after breast reduction surgery.
My suggestion is that you should seek another plastic surgeon who is specialized in breast surgery, and you might need further reduction surgery of your left breast.