Stamp Filter is not working properly

Hi, I wanted to create a Realistic Photocopy Effect in Photoshop by using a Stamp and grain filter. I followed a YouTube tutorial but my stamp effect is looking so weird on every image.

So just for testing, I copied the image that was used in the tutorial and applied the same settings in grain and stamp filter in my Photoshop but with the same image and same settings still, my final effect did not look normal.  Can anybody let me know, what the issue is and how to fix that? I have attached the screenshots please have a look. I also mentioned the settings that are used in the tutorial. Thank you.

Settings in Tutorial

Grain: Intensity 33, Contrast 47, Grain Type Regular
Stamp: Balance 13, Smoothness 4