The format for the 19th Chess.com tournament, which just started yesterday, is apparently 6(1)->1. The last several Chess.com tournaments used 6(2)->1.

I'm disappointed about this change. In a round robin tournament, why not have each player play two games, one as White and one as Black, against each of the other players?

Does anyone know the reason for the change?

I believe you'll still get both games, just that they'll be one after the other. No idea why the change, though.