How to uncouple masks

I made some edits to the sky in a photo using the object recognition panel. However, when I try to select another part of the photo to edit, it combines it with the sky, thus applying the adjustments to the sky at the samd time. I've looked at Adobe's tutorials and see nothing that addresses this. It makes it look like each edit is handle independeltly.; mine is not. 

Help, anyomne?