I had this issue once, no matter what i did about resizing, moving, or changing settings, Nothing worked. I just recreated the whole thing, and it worked just fine. If you are resizing the volumes by directly changing the numbers, that could be the issue. Try just using the resizing in the actual editor window. I heard using the direct numbers causes issues, But I cant verify, other then after the time i had that issue, I always used the scaling option inside the editor window directly, I never had the issue again.