why the signature is invalid?

I'm using acrobat reader(version:20.012.20041.1044) on windows 10.

I found a special pdf document that after sign multiple, just only the last signature is valid when opened with adobe reader.

No one tell me signature is invalid, just certificate is not trust.

I don't know why adobe reader tell me signature is invalid.

Pleasy help me, thx!

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Legend

Is the same person making multiple signature? That is very wrong.

Participant

OK, i signed the same pdf with two different person again,but the signature status is the same as before.

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