It sounds like you have a "reversion" so most likely it returned to the original non-variegated plant.
(I guess there could be, theoretically, a small chance of it having formed an all-green new mutation but you can't really know without DNA testing and seems less likely.)
The solid green plant will be more vigorous than the variegated ones. That's why it's good to keep all-green reversions cut out of a variegated plant so that it doesn't overwhelm the variegated parts. I'd give the green cutting its own pot so you don't have that problem.
to ATP!
