Well, Sarr rhizomes do grow in a particular direction, right? It's not like a potato that just swells up underground and grows straight up every season - the rhizome gradually elongates with each new leaf, running parallel to the surface of the soil. It might be that you planted it with the growth points near the center of the pot, and now, 2+ years later, they've grown all the way over to the side. If it really bothers you, try repotting it next year and look to see where the points are.
~Joe