Initial time machine backup larger than the original

I have been using time machine with a 1 TB time capsule without issue on a older Macbook in the house. I just got a Macbook pro and am attempting to backup on the same time capsule. During setup, Time machine states there is 118GB to back up when looking under options (which is correct). Then when it goes to back up after "processing" it states that it is backing up 330gb (larger than my harddrive of 250GB). I took off about 167 GB of files off the time capsule. I erased the backup file on time capsule and started over. It still says that there is correctly 118GB to back up before it starts but now after processing it says it will be backing up 163 GB. (330GB-167GB=163GB) Of note there is 45GB of other stuff including the backup of the other Mac still on the time capsule. (163GB-45GB=118 GB.) It appears to be calculating to re-back-up what is already stored on the time capsule. How do I deal with this issue?

Your backup drive has been use to backup both computers. TM may think it should still be backing up both computers. If both computers are on the TC network that would be the normal expectation.
If that's not the case but you've given the new computer the same Computer Name as the old computer, then TM may be trying to backup files that are non-existent but still located in the backup set. If this is the case, then reformat the TC.

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