Distorted sunchokes - diagnosis?

Tried growing these in containers in NZ, but all are deformed. We don’t have asters yellow in NZ yet (fingers crossed), so baffled. No idea how the tubers might turn out, but not hopeful. Any ideas what caused this?

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Possibly herbicide drift? Does anything else nearby have distorted growth?

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Nope, nothing. But yes, might have been residue in compost I bought, altho nothing else is affected.