For Desktop users:
The best way to avoid it is to always use "Save-As" the very first time the second file is saved....and make absolutely sure the new file has a unique filename at that time.
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For most folks this happens if the second person's had the same first name as the first one which was prepared.
But....can also happen if they didn't actually start a brand NEW file for the second person.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
