No it's fine. They have a habit of starting off all red, then eventually turning to red & white. They can have all white flowers towards the end of Summer if I recall correctly.
I have the same thing - some years all red, some years all white, and some years a mix. I think it's to do with how much rain they get. Or something. I just enjoy the changes over the years. I don't think it's doing the plants any harm.
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border