Stan,
Check the crimps of the fired shells that you are loading. If you find any that have even a minor crack, or deformity, where the crimps are those will be the ones that come out like those you've pictured. In case you miss any visually, you should be able to see which ones will be bad as soon as you pre-crimp them. If you want to shoot the deformed shells anyway Craig's suggestion about an overshot card is a good one.
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