Eraser opacity lowered and I can't fix it?

This is a recent problem that I've been having. Whenever I go to erase something, the eraser doesn't fully erase it. It's as if the opacity has been lowered, except it's currently set to 100 on both the layer and the tool itself. This also seems to happen in every file that I open up. I first noticed it in one drawing that I was working on, but when I opened up a new file I was still having this problem.

The above is what it looks like whenever I try to erase something. Is there anything that I might have accidentally checked off? Anyone know how to fix it? I'm using Photoshop CC if that helps (I'm also kinda new to photoshop, so please be as specific as possible).

One other thing, is that I only seem to be having this problem when I use my tablet. When I use my trackpad to erase it erases normally.