My white pom pom tree has turned pink??

I have two Viburnum Opulus Roseum that have been cultivated into standard ball trees in large patio pots.  They have had white pom poms every year so far, up until this year, and then the pom pom flowers turned pink.  The only thing I can think is that they may have been drier than usual with the hot weather.  Is this usual,  will they always be pink now, or will I be able to get them back white?  Please can anyone advise me?

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