Collectible Card Game Headquarters

I've downloaded the current build of Forge, no modifications or custom user settings.

When I load a deck from the "Random Commander Card-based Decks", occasionally I get
"deck must not contain more than 1 copies of the card" message; for example
"deck must not contain more than 1 copies of the card Kraum, Ludevic's Opus"

But I can't seem to find where these decks are stored, so I can edit the decklist and fix the problem.

These are not decks created by me; these seem to be semi-preconstructed, and came as part of the download.

Are these decks findable, and editable?

I'm facing a similar issue with the "Random Commander Card-based Decks" in Forge. The "deck must not contain more than 1 copies of the card" message has got me puzzled too. I've been trying to locate where these decks are stored, but no luck so far.