Not strange, just "differently". The ailerons would work just fine if you only lowered the aileron opposite the direction you want to bank and didn't move the opposite side up at all. Depending on the model you might get something of a "barrel-roll" going on for a complete roll but it would bank just fine.

Lowering an aileron gives that wing some added drag and lots more lift. Raising an aileron causes the wing to have a lot of drag (remember, the air travels faster on the upper surface - hence the ability of a model (or any aircraft) to fly - and acts as a spoiler that "kills" lift and lowers the net angle-of-attack. That drag tends to pull the wing behind the opposite one which is lifting, giving yaw. A model can be balanced by altering the up vs. down throws so it rolls axially along it's central axis (pattern fliers especially want this).