It’s not that uncommon to find plants such as dandelions or daisies with a weird elongated flower. This effect is termed fascination and is found in other plants too and often results in a flattened stem rather than the normal cylindrical shape. In extreme cases the flower can become extremely elongated and sinuous. There seem to be a number of causes for this occurring including bacterial infection, hormonal imbalances and genetic mutation (that could be caused by environmental effects).
Possibly more unusual if less strange-looking is when this fascination is such that multiple but separate flowers form on one dandelion stem. Obviously many plants do have multiple flowers on each stem but dandelions only have one.