Also, not all controllers calibrate the same in windows. Even the same controller will calibrate differently on each computer. In addition, each plane will trim differently.
Recalibrate the controller, then, just as in real life, take off and use the trim tabs to achieve a level flight. Once the plane is trimmed, the dihedral wing will roll back to level. If the ailerons or the rudder are off just a little bit, the plane won't fly right. {simulating reality}