Digital Signature Discrepancy

Hi there, I am writing because I am baffled by this problem.
I have two PDFs, signed by the same person. All the properties of the signature are exactly identical. Yet for some bizarre reason, one shows a warning message "At least one signature has problems" while the other does not.
Now, please note that My issue is not necessarily to get rid of that warning. At some point, if I can figure out how to make it go away, I may investigate that. For now, my focus is on the Discrepancy between the two documents
Is there anything that would cause one document to show a signature warning, while the other does not? The signature properties are 100% identical for each document.
Thanks for your help. I don't mean to sound pushy, but I know full well how frustrating it is to seek help in a forum and have people (despite good intentions), focusing on the wrong part of the issue.

The "short list of criteria" I mentioned is the Validity Summary:
1) The Document has not been modified since this signature was applied.
2) The signer's identity is unknown because it has not been included in your list of trusted identities and none of its parent certificates are trusted identities.
3) Signing time is from the clock on the signer's computer
Now, there is a check mark beside 1) indicating that it has not been modified. 2) and 3) show the warning labels beside them.
I know what you're thinking: "If the original warning says 'Signature validity is unknown', and number 2) shows a warning sign, then there's your problem, dummy!"
The problem is, the exact same things appear in the document that doesn't show me a warning label when I open it.
It's got me stumped

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