An oscilloscope probe must be compensated:

Oscilloscope probes contain an adjustable capacitor designed to match the probe's capacitance to the specific input capacitance of the oscilloscope. Because different oscilloscopes, and even different channels on the exact same oscilloscope, have slightly different input capacitances, a probe must be compensated whenever it is moved to a new scope or channel. Proper compensation ensures that high-frequency signals and the leading edges of square waves are accurately represented on the display without overshoot or rounding. This is a hardware calibration step, completely independent of the type of signal you are measuring. The distractors are incorrect because compensation does not involve simply adding a series resistor, nor is it a setting you adjust based on whether you are measuring a sine wave or a varying frequency.