Why are all my gladioli pink?

I like gladioli. The simplicity of their upright shape and the confidence of the great single spear of blossom is appealing.
Over the years I have bought a number of packets of flat corms of various colours and each autumn I faithfully dig them up and store them in the basement/ cave away from the winter snow. In high summer they produced lovely flowers of yellow and red and I think even purple, but now they are all the same colour: salmon pink.
At first I thought my memory was playing tricks and that some other colours had come and gone and I had not noted them, but this year I am sure: every last one has turned salmon pink.
Does anyone out there know the answer to this mystery? I would love to know! Ideas, however fanciful please!

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