This is the answer to this problem that Lucas answered as I was able to replicate it if I added two fields with the same display name to the Account form and then attempted to download the Account form data template. Using the Metadata Document Generator tool in the XRMToolbox utility, xrmtoolbox.com, you could export out the attributes for this particular entity and make sure to include the form location as then you can find this easily using Excel's duplicate detection functionality and filtering/sorting options.
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