when the crosswind is from the left, after applying left aileron and right rudder, a sudden blow of wind yaw your nose to the right and u found u are blown to the left side of the centerline.
That's the result of fluctuating winds (direction and speed), which is often the case in the real world. As other's have said, you have to look out the window and judge for yourself what rudder+aileron combination is needed. Be prepared to change your crosswind inputs in the flare maneuver. Practice is king.