User Activity

I noticed when I attach both the RF 24-70mm f2.8 L IS and RF70-200mm f2.8 L IS lenses the image stablization icon is just a  ((hand)). However, when I attach a RF 15-35mm f2.8L IS lens, the icon changes to ((hand))+. Does anyone know what the + means...
Is it normal for the sensor to be moving freely when the camera is turned off? The moment i turn on the camera, the IBIS gets activated so the sensor doesn't float around but when I turn off the camera the sensor seems to be freely moving.