Warning: Timesteps in the transient analysis are too high (in respect to the period of some sources)
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The simulator (the transient analysis) works with an automatic timestep control, that picks the largest possible step size at each time point, but so that it does not exceed certain calculation error limits for the computed points (voltages or current at a certain time). Additionally the maximum timestep can be limited, so that the simulator could overcome nonconvergence (error message: Time step too small), also the curves becomes smoother.
Not an error: If you design only a simple circuit consisting of an sinusoidal source and a resistor, then it could happen that the computed points for the current do not appear as a sinusoidal curve. The points are lying on the sinusoidal curve, but for each period there have not been computed enough points, in order to recognize it as a sinusoidal curve. The maximum timestep should not exceed 1/10th of the period of the sinusoidal source. These settings can be done also via the automatic correction.