My abs have gone wonky?

My abs started to show about 2 years ago (I was 15) and have always been even size and shape and symmetry until a few months ago when I noticed my rib cage had gone slightly uneven; the bottom sticks out more than the one on the other side (no breaks or damage), and now the section of the ab closest to it seems to be sticking out aswell. I heard some people get this when they are growing and the ribs even themself out eventually. Anyone know if this is true?