How to reproduce:

Create a OOo Calc sheet with a diagram.
Change the colors of the diagram (i interchanged yellow and red)
Copy the diagram from OOo Calc into OOo presenter.

Result:

First, the new diagram looks as expected. But when firing up the presentation in
Presentation Mode, the colors change back to the default, as if I had not
interchanged them. Still, the colors are displayed in the presentation view in
the intended view. Now when doubleclicking the diagram for editing it, I can see
the "real" (wrong) colors. Changing them in this view permamently fixes the
problem in the presentation view as well.

Of course it would be desireable for the colors to stay exactly the same as they
were in my OOo Calc sheet. A sample sheet is attached.