Link Is Not Fetching Correct Photo On Social Media

I am using Neptune Theme of ThemeForest. The problem is, that when I post a link on my FB Page and Twitter, it doesn’t show the particular photo rather different photo of the same post. I am in trouble. Please help. I am running a food blog and Photos are so important for it.

It’d better to ask the author instead of posting your issue here due to this forum is for general purposes but not for item support