Why are two Color labels not displayed in the plan view

I defined a plan view for user stories. A user story workitem type has two additional custom values:
RAG status - it can be blue, green, yellow, red.
Content - it can be base or extended.

I defined a plan view where there are Colors labels for both fields (6 Colors entries: 4 for RAG and 2 for Content), but in the plan there is only the first label displayed. I use RTC 5.0.1 through browser client.

Any idea what's wrong with my definition?

Thanks

Robert