Signatures appear as pictures

Hi guys,

I signed an agreement with my signature and Acrobat tells me that the signature is ok. Also, there is the blue ribbon on top of the document. And rightclick over the signature show a different context menu.

I send this document to my partner and get it back with his signature, but there is no ribbon and when I rightclick hovering over the signatures there is no context menu for signatures. Just the normal context menu.

I attach two screenshots.

What can gone wrong?