This is the first time this has ever happened, willow sticks that have dried at different rates on each side of the stick. This is what happens, the dry side curls more than the wetter side.
I have finally learnt how to make flowers the traditional way, with just a knife. I was getting very lopsided flowers and thought it was my technique. I put the same wood on the shaving horse and got the same result. These mutant flowers rather appeal to me, they tell a story that only a very few people would notice.