Follow the instruction on the Bambu wiki https://wiki.bambulab.com/en/knowledge-sharing/CMYK-color-lithophane-printing-instructions%20 to make sure you have the proper settings (or just dont change a single thing from my upload, as its adusted correctly).

You will need the CMYK kit from Bambu to acheive the same results

Lithophane Resolution: 0.25
Colored Resolution: 0.8
Layer Height: 0.1
First Layer Height: 0.15
Filaments for Color Palette: eSun Warm White; Purple/Magenta; HATCHBOX Yellow; AIO Cyan (if you dont have the Bambulab CMYK kit)