Share buttons on images

Hi,
I recently have noticed that on Chrome, Edge, and Safari (these are the browsers I checked), the images on the site are not recognized as images, and therefore Pinterest share buttons are not showing on them.
They only appear when I use Chrome AND I am also logged in to my WordPress account, so I think it’s not about the tools I use (Pinterest or ShareThis), and it’s on the website.
Can you please check?
thanks!
Moshe