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That's nothing more than a jump from low bucket to high bucket and all such jumps are massive. For one adult, Roomette fares can as much as double from low to high bucket.
In may I booked a roomette for 2 adults on the CZ travelling CHI-SF in february 2022. I paid $789, wich I believe was lower bucket, or at least a fair price in my opinion.
I have been monitoring the price since, and it recently went up to $1278. I would call that a massive jump in price.
That's nothing more than a jump from low bucket to high bucket and all such jumps are massive. For one adult, Roomette fares can as much as double from low to high bucket.