PDF file with verified digital signatures prints with a question mark "Signature Not Verified"

Hi!

I use Adobe Acrobat Reader DC 2015.023.20070.  My problem is when I print a digitally signed statutory form (with the signature area showing "Signature Valid" and a green tick mark), the printed page shows "Signature Not Verified" and a ? (question mark) in place of the tick mark.   The comments and forms selected is "Document and Markups", yet the print comes with a question mark. 

Further, when I mail this pdf file as attachment, the recepient sees the pdf file with a question mark and a remark "Signature Not verified".

Can someone help me to get over these two problems.