Crazy colours in categorized rows when using color columns

Hi,

i have a categorized view with total values in the category rows.

And I have “color columns” (columns to change the background of the columns - the font color is always black). for the detail rows, not the categories.

Result: The font of the total values in the category rows is shown in almost all rainbow colours! Each category row in a different color (sometimes repeating…)

What is this??? I cannot give this to our CEOs…

(I can reconstruct this effect in every categorized view with total columns).

Thanks for any help in advance