Hi @hannahritner, thanks for your reply.
I think I haven’t. There is target=”_blank” on my website since I remember. I only changed product button below the title (originally there was a direct link to external affiliate page), but it does not affect the picture and the title. When I restore the original settings (and remove my dedicated function), the problem remains.
The other thing is that my Virtue theme is not up-to-date. Can it be a reason? Was there another default target attribute in the previous versions of the theme?