digital signatures just dissapeared

hi there, using acrobat reader, , after several persons digitally signed doc using digital certificates, when next 1 came in , public body, signing digitally using own platform, of sudden signatures panel empty. signature marks remained on document, signatures panel empty. what´s going on here? sigital signatures still valids or not.

 

so, in image can see 1 signature mark using acrobat left printed, certificate data on signature panel right shown. when next member signed using own signing platform, leaving mark 2 on pages of pdf document, signature panel showing no data @ no more.

 

so, question is, still valid doc because shows marks, or not more if signature panel empty??

 

something marks pages not valid digital signature. sounds stamping tool used deleted signature info.

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