Originally Posted by Gabe15

This type of symptom is common with container grown bananas, and is normally caused by too much fertilizer. It should go away when in the ground. If you were to continue growing in a container, I would recommend to flush the soil with water, and cut back on fertilizer. When I used to grow bananas in containers, I would prefer just to add all nutrients up front in the form of compost mixed into the medium, this was plenty for the plants to grow and fruit, and helped to avoid this problem with excess nutrient build up.