Image problem

I have a problem and that is when I write an article, which I will publish on my website and not having a picture in the article, so grab it with a different picture when Social Backlinks run the update. I've tried it in several places to see this is not the fault lies with me, maybe a setting. Gets mad it's not funny when it takes a picture that is not associated with my article. What do you think it might be clearing the cache on my jommla page and the computer still get the same error.