Ghosting is a common problem. Are you using a tripod? Or is the camera handheld? Also check to make sure you aren't getting a double exposure. I was looking at some pictures that I took 30 years ago of my Mom (she has since passed) and some were double exposed and had ghosting from double exposure. One actually was a really nice effect.. LOL~
There are many possibilities causing this.. Lighting in the wrong place or angle.. Lighting too hot (you need reflectors typically in the studio)... Reflected light coming from an unwanted source.. overexposure, etc. Maybe a shot of your studio could help a bit.. hard to tell just from what you are saying. HTH
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