What happened with this plant?

[ruweiss]

One of my first Saxifrages was Sax.x irvingii "Jenkinsiae" and I propagate this fine plants
since many years by cuttings. The result were always identical plants, but this year one
plant formed to my amazement quite different flowers. What can be the reason for this?
I also wonder, how the flowers will look next year.

[Lesley Cox]

If it were just one flower I'd say a critter had eaten a hole in the unopened bud but not when it is every flower. Perhaps some kind of mutation? It is very different and you'll be doing some cuttings in case it is constant, for a new variety.

[ruweiss]

Lesley, thank you for your kind reply. It would be fine, if this unusual growth
would be permanent. Next year we will know more.