Am I the only one who experiences channel imbalance in SMSL M100 DAC?

When SMSL M100's volume is 100% and the sound is loud, the right side produces a lot of crackles. The left side doesn't.

When its volume is 97~98%, there is no crackle.

Is the right side broken or simply louder than the left side? If the right side was substantially louder, there could be clippings in the amplifier RCA input.