Ideal White Balance From X-RITE chart

[DaiDengxin]

Hello,

Thank you for amazing work. I have a question related to white balance. I have following piece of code
reference_color_checker = colour.CCS_COLOURCHECKERS['ColorChecker24 - After November 2014'] reference_swatches = colour.XYZ_to_RGB( XYZ=colour.xyY_to_XYZ(list(reference_color_checker.data.values())), illuminant=reference_color_checker.illuminant, colourspace=colour.models.RGB_COLOURSPACE_sRGB, apply_cctf_encoding=False, )
Last six swatches in the color chart correspond to gray patches with different intensity. Therefore, they all should lead
to same color balancing coefficients. However, they all producing slightly different coefficients:

What can be the reason for this behavior?