Can't sell duplicate monthly awards

For some reason my new monthly awards are not sellable. I purchased and collected them early, then when earned I figured to sell at market price. Only now I can't even though I earned the duplicate. What gives?

It isn't in a lineup, uncollected, and not in events.

The cards you get from the packs after Rizzo aren't sellable

Like he said, look at the packs on the path, there's a no sell red circle on the top left corner

I know, just seem stupid that I can't replace the no sell card with a sellable version collected. No sell is a stupid concept if the card is available on the marketplace.