Your surgeon may have had good reason(s) to lower the inframammary fold. Lowering the fold, in and of itself, does not cause "bottoming out." A combination of skin and soft tissue elasticity, patient activity post operatively, tobacco use (retards healing and collagen formation), genetically determined healing characteristics, size and weight of the implant, as well as surgical technique and pre-surgical patient anatomy all influence the position of the inframammary fold after breast augmentation.
At the end of your healing process, a perfect result is partly characterized by a nipple at the very forward most projecting point of the breast, which should be in the very center of the breast mound. If you had a low nipple areola complex pre operatively, but didn't get large enough implants to sufficiently lift the nipple to the breast center, your surgeon had a choice of adding scars (breast lift) or lowering the crease so the center of the implant (and your breast) drop slightly so it is directly behind the nipple. This strategy is frequently employed to avoid formal mastopexy and its associated risks, provided the inframammary crease is high enough pre surgically to permit some lowering.
Because of the complexity of healing and the multiple factors influencing the precise position of the inframammary fold (which changes over time) post operatively, it is impossible to predict and completely control. Bottoming out is thus, unfortunately, not an uncommon problem. Fortunately, it can be fixed.