Progression of a die subsidence error - Shield Cent

Got these all in a roll of 2015 cents. Noticed that a lot had a small bump or raised area above the shield and that some were varying in size. Here are a few as they get bigger. Notice the same die chips at the top near the rim. Would this be a result of die subsidence?

Here a couple others from the same roll without the die chips at the top.

 

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Pretty cool to see, thanks for sharing.

 

Interesting anomalies but unfortunately very common.

 

Yes, this part of the die is sinking in, and the edge of the subsidence zone is demarcated by a crack.

 

Thanks for the feedback.

 

It is interesting to see a group that shows the progression. Much better than seeing one in isolation.