Sorry, but double bubble is one of those things that occurs in certain patients with certain anatomy. It may be more common with some anatomic conditions such as short inframammary crease-to-nipple distance, in very thin patients with dense and clearly-visible breast tissue "edges," in patients who request large implant sizes, and in cases of surgical over-dissection or patient excessive-dropping.
Over-dissection sounds like a surgical "error," but we never know in advance just how much softening, settling, and scar stretching will occur in any given patient, even with years of experience and thousands of breast augmentation cases.
Your last photo depicts activation distortion, another type of post-surgical concern, but one that can certainly occur with or without double bubble issues. It is clear that your pectoralis fibers were released inferiorly (as they should be), but now that your pocket has softened and healed (and swelling has gone down) to a great extent, those cut muscle fibers have healed to the breast capsule, causing it to visibly deform when the muscle is contracted. Activation distortion is entirely different from double bubble, but they look similar to one another.
I would first wait at least 6 months (12 months is better, or at least until your scars have completely faded--this is a reliable indicator that your internal capsule has done the same degree of maturation) before considering re-operation. Your lower breast tissues may stretch and obscure the double bubble appearance to a large degree. If not (or not enough), you and your surgeon can then decide what should be done surgically.
Surgical correction depends on the degree of the problem at that time, but usually invloves internal capsulorrhaphy to tighten the capsule and raise the pocket slightly. Sometimes use of capsular flaps or ADMs (acellular dermal matrices) helps. These surgical corrections are usually successful, so do not despair. Stay in close contact with your surgeon--this is not his/her "fault," nor is it yours. Best wishes!