These are all good questions that I do not know the answer to.
First, what calls (month, price) were exercised?
When a call is exercised, is that that transaction represented on the tape as X00 shares at the strike price? Some other price? Not on the tape?
If it is represented as a transaction, volume goes up. If the writer has to buy shares to deliver, or decides to buy shares to replace called (all) shares, it goes up double.
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