Channel Power in Green has:
[Chaos Star]: After resolving this action, lose all power in excess of twice your WP and suffer 1 stress per power lost this way
Channel Power in Red has:
[Chaos Star]: At the end of your turn, lose all power in excess of your WP and suffer 1 stress per power lost this way
So... in green you could gain too much power and be forced to let some spill, because it happens BEFORE the optional quick cast spell.
In red it will never happen since it will happen AFTER the optional quick cast spell.
Shouldn't the Red be something like:
[Chaos Star]: After resolving this action, lose all power in excess of your WP and suffer 1 stress per power lost this way