I have the same problem. It has nothing to do with the hight of the picture in my case. Even when turning back to the demo images it fails to do it right. Problem is that it does not start on top of the image. No matter which setting you choose. I saw you had this issue before and fixed it with an update. Now maybe this issue has returned with the latest update? I updated the theme this week with the lates version. Maybe something to check?