I suspect your you're both right. When it comes to metadata PDF's are like images, they have multiple metadata blocks, often containing similar data but not necessarily the same data (eg a jpeg can have at least three Comment 'properties' - all of them different)
I just converted an epub to PDF. First attachment is from exiftool (GUI), second is from Tracker XChange and the third is from Nitro Pro
Note the inconsistencies - I tend to set more credence by what exiftool 'says'
BR
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