Facebook share link UNWANTED image

I have a strange problem and my PM requires me to fix it. None of my colleagues could help me.

I've added a functionality to existing ASP.NET WebForms page. I involves a button to share the link by facebook. But when sharing in someone's profile a strange image of Adobe is appearing:

Undesired Image

It is even more strange that after a few seconds it disappeares. Tried everything - to give a parameter to the facebook URL with images[0], also from the meta tags in the master page. No result. Supposed the facebook may have cached the link, but when I tried from my home PC the result was the same.

Any advice how to remove the adobe pic?