Yeah, Poser is kind of buggy like that. Especially when you use the "Posing Camera". If you rotate some things exactly 180 degrees on the Y axis, they tend to disform also. Usually a render will look normal, but the workspace is a jumbled mess. There are times however that the actual item of clothing (most likely suspect) will be jumbled as well in the render, but that's unlikely (in the cases I've seen it).