When new leaves are affected as they are emerging that is usually a sign that the roots are suffocating from lack of oxygen because the soil around the roots is staying wet for too long. That can happen very easily with a plant in a very large pot, especially if you added soil to the top of the original rootball when you repotted it.
Soil on top of the rootball serves no purpose, but it can deceive you as to how dry the soil is around the roots. If you did add soil to the rootball, I suggest that you remove all loose soil from the top that is not in immediate contact with the roots. That will allow oxygen to penetrate the root zone more readily.
Keep the window completely uncovered during the daylight hours.