It's intentional....do some research on Ackerman steering. When you turn, the rudders have different angles of attack to give less drag as the two hulls travel through arcs of differing radii. (Cool stuff!) It is accomplished by having the crossbar shorter than the distance between the rudder pivots (pins). The tillers are angled in (going from back to front). That's why, if you put your rudder assembly on backwards (reversed left/right), you'll have a load of toe out and your cat becomes a dog!