Why are social media buttons ignoring the site's data-image?

Question

In contact with

Good day! I would not write here if I had not racked my brain for 2 days.
There is a site gobanner.ru
There are social buttons. networks at the top, we are interested in the "in contact" button.
Actually, when we click on it, it doesn't find an absolute link to the image, which seems to work well:

However, if I paste in the share42 data-image div a link to an image from any other site, everything will work and the image will be displayed.
Below are 2 examples. Not a working version with a link to my image and a working version with a link to someone else's image.
1 - https://www.dropbox.com/s/g0o4iqpe95twtc0/problem.png
2 - https://www.dropbox.com/s/xmypbdqcui6ut8a/problem2.png
Guys, what's the matter? I'm already starting to think about hosting, maybe there are some problems?
My first post here, I tried to make everything as clear as possible, thanks in advance to everyone who helps.

Answer 1

1.
The address of the picture can be entered manually
https://vk.com/dev/share_details
2. Add og:image UPD
to the Open Graph markup . Hmm, I didn’t quite understand the question. Looked at screenshots. Weird...