The RecoStudio MultiCam app has been designed to work with the camera sensor in its natural orientation. This corresponds to holding the device with the Home button on the right-hand side.
If you wish/need to use the device in the other orientation (with the Home button on the left), please go into the grey Settings app on your iPhone. Scroll down and select "MultiCam" -> Device Orientation -> Inverted.
If you make use of special lenses which invert the image, please go in the iPhone Settings -> MultiCam -> iSight Camera Lens -> "Invert".