The total amount that you currently own in CEG is worth whatever it is worth. No spinoff or split changes the amount that you paid into the stock. You know your total basis if you have the DRIP going all the way back to the original purchase. You also know the original investment. Take the percentage that you sold, take that percentage of the basis and you're all set.
If the basis that is shown on your 1099-B is incorrect then you should do a correcting adjustment to show the basis as it should be so that it is correct on your return and contact your broker to get them to correct the basis for future transactions. They may also be able to correct the 1099-B you were issued for 2022.
@chitowncrystal44
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