Does anyone know how a flowering shrub can have all white flowers and only one peach flower with a different center piece.

I took a picture of this shrub but I don’t know how to post it on here. Any how all the flowers are white with yellow stamen in the center. In the whole bush with hundreds of flowers it has one peach color flower with no stamen. Just a hard bulb in the center of the flower. Is this a freak of nature or is someone familiar with this plant? There were other identical bushes with the white flower but out of all the bushes this is the only one with the one odd flower.
Is anyone familiar with it?