Euphorbia Milli Throwing Green Flowers

So, my Euphorbia Milli has been throwing out green, leaf like flowers. What's happening? How to remedy?
The original colour of the bloom was a pinkish-red.

The original colour of the bloom was a pinkish-red.

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Compare the pic in the post to the pic of its showy bracts when I had bought it.
I live in west central Scotland - not where that photo is...