They're really pretty, Claudia. They look more like sports to me than the plant reverting with those random flashes of orange appearing in the yellow flowers. And yellow in the orange . . Maybe that's why they named it 'Flasher' ??
I'd be inclined to leave it alone for another year and see if it keeps doing this. And yes, remember not to divide it and give pieces away until you're sure who's who.
Did you ask the friend who gave it to you if hers does the same thing?
