Difficulty with moving photo layer out of a video group

When working with photos and video in Photoshop I need to drag a photo layer out of the video group. I always have to do this multiple times before it actually drags the layer out of the video group; the photo layer does not actually move out of the group until you position it outside the group just right, though each time I attempt to drag the photo out of the video group it records it as a history step even though nothing happened.

1. Is there a trick or way to ensure that the photo layer is easily dragged out of the video group?

2. Why does each attempt to move the layer become a history step even though it is not moved out of the group?

Thanks.