Answer: Since your other two plants are fine and this one seems to grow and set buds just fine (with the exception of the opening problem) and this has continued for several years, I don't think there is anything you are doing wrong or need to be doing. Based on your description I don't think it is a pest or disease issue either. I think this is a defect with that particular plant. You might want to check with your local county extension to see if they have any other ideas, but unfortunately I don't think there is anything you can do.
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