Sawtooth edge problem on one side

Phenomenon:
After pressing and tearing off, there is a slight serrated edge on one side, but no such phenomenon on the other side

Possible causes in order:
① The stepping is inaccurate, resulting in the separation of color and white, pressing and tearing, and the tearing serrated edge appears on the inward side of the white ink
② Excessive release force

Workaround:
Adjust white ink coverage
Increase pressing pressure, or press twice before peeling

Calibration step