crystal reports stacked bar chart looses give color

Question

Hi

i am working on crystal reports 11 created stacked bar chart which gives value depending on change of 2 columns.

now problem is it looses color i give it... for example if pass = green, fail = red, awaiting = yellow

after rerunning it for different parameters it changes to fail = green, pass = yellow etc

any suggiestions?

thanks Amrita