Sound like it was fresh from the garden centre where it had protection. Wisterias dont like early spring morning sunshine hey can suffer from frost damage.
I just think that the change in conditions upset it abit this year before it became aclimatised. Give it a regular liquid feed and train in the runers to your frame work. I wouldnt prune until the plant has reached where you wanted it to grow. It should be much better next year.
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