Problem with Opacity
So for some reason if I click once with a brush it is opaque like below

Both the brush settings and layer settings are set to opacity: 100%. I've tried this on multiple files, both a mouse and drawing tablet, and I've clicked "Restore Default Brushes".
If I drag the brush however it does become opaque, but it's more pressure sensitive than usual on the tablet. Below is a single stroke. It would often not vary that much from a single stroke.

