Why is this happening with my pencil?

As I try to show in the video, my pencil is only working on smaller brushes, and not even to their full capacity. They’re coming out super tiny for some reason, I know they can get much bigger. If I want to use a bigger brush I need to use my finger which obviously doesn’t work well. Any ideas? It’s a new tip on the pencil as well. I know the screen doesn’t look the cleanest now but this has been happening all day and cleaning it was the first thing I tried earlier.