Pages Going into Supplement index

new and fresh pages going into supplement index

[dhaliwal]

I am seeing many of my websites and the google has turned them into supplemental index.
The content is not duplicate.

I even noticed that a forum am running, it was having all the way new messages and just after it was indexed 7 days back, its into supplement results.

I am not sure whats happening, anyone noticed such behaviour?

Thanks
Dhaliwal