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What is wrong with my dahlia ?
in Plants
One flower stalk has one almost normal flower, and one half flower


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Looks like a form of fasciation — occasionally plants (including dahlias) develop double flower heads on one stem
Below are a couple of examples posted in the forum. The first link is in the “Fascinated by fasciation” thread. You could post your photos there to add to the thread.
https://forum.gardenersworld.com/discussion/388011/fascinated-by-fasciation/p15
https://forum.gardenersworld.com/discussion/1015400/double-dahlia-but-not-what-you-would-expect
https://en.m.wikipedia.org/wiki/Fasciation
I live in west central Scotland - not where that photo is...