Does the robot's state provided by "ArticulationData" class from Isaac Lab contain random noise?

When a vertical thrust and a z-axis moment are applied to a quadrotor’s propeller (all propellers’ thrusts and moments are equivalent), the quadrotor is expected to move vertically up and down (following the z axis), but the simulation result is that the quadrotor shifts in the x-y plane except for the vertical up and down motion. I want to know is this caused by random noise from the physics simulation?