How to Validated Signature in All pages of Acrobat DC

A digital signature may only have one visualization on a single page of a document or none at all. Adobe Acrobat used to accept signatures with multiple appearances but that was essentially the result of a missing validation check, not an explicit acceptance of those signatures.

This missing check may be added in any new Acrobat version. Maybe it recently has been added and you see the result.

(Strictly speaking there is a loophole in the specs allowing for multiple visualizations of the same embedded signature value but most implementations creating signatures displayed on multiple pages don't use that loophole and, therefore, create invalid signatures by strict interpretation of the specs. If you can share an example document, we can check whether it uses the loophole or indeed uses an explicitly invalid approach.)

Or did I misunderstand you and you actually have multiple digital signatures, one on each page?