Sounds like you have a bigger garden than us, Cindy.
Suspect a bigger area to garden can give more options.
Divided the first of those two reverting Brunnera today.
Very easy; the eight unverted plantlets(?) just fell apart.
The two reverted ones were much bigger and still connected.
Planted two groups of unreverted.
Hoping they'll be around next spring.
I feel sure, with that plant, that simply cutting off the green leaves would not have solved the problem.
The associated root development was much stronger than that of the rest of the original plant.