leaves and flowers that are variegated, or splotched with white or cream, tend to be unstable, meaning some growth can be on or the other color

One of my friend's Tropical Hibiscus "El Capitolio sport" has done the same thing recently i.e a pure red bloom among peach colored blooms...

Izhar

Last year I had a peach colored one that had single and double flowers on the same plant - I never did take any pics of it.

Here is a link that might be useful: Tropical Hibiscus

I have a red hibiscus that produced a peach and red flower on one branch. They do mutate as far as I understand.

Here is a link that might be useful: my rustic bajan garden