Ok, I looked up which one you are doing on Phlearn. I see why he is doing the Black and White with it. It makes sense because he is teaching you to do a Blend/If technique, doing the luminance values and the color values separate in this adjustment.
So, you must have been clicking around kind of a lot there. At this point in the tutorial, you should only have the background layer and a B&W adjustment layer above it. So, you can try...
- Highlight the layer named Background Copy, and hit delete. That will get rid of your extra background layer and get rid of the clipping of the adjustment layer to the layer below.
When you go to add the other adjustment layers he will ask you to add, don't press any keys when you do so. Just make sure either nothing is highlighted or at least your top layer is highlighted, then just click on the appropriate icon in the Adjustments Panel. This should help you avoid clipping things together.