What varieties are they? Are the unaffected ones a different variety?
I imagine Marsha's probably right. Another thought is a toxicity or deficiency (e.g. too little copper), but if it's the same soil as the others, that seems less likely (unless it's a variety used to different nutrients than the others). Copper deficiency is said to be more common with organic gardening. I don't know, though. It's just a thought.
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