This will be weird to explain, I apologize for that.
Frequently I need to refresh the app (by fully closing / reopening) as there are some settings in the brushes I use that seem to glitch out or turn off, even though they are clearly on. I am not really clear on what causes this glitch.
One of the more noticeable changes is the Noise option, under General.
the lines on the left are the incorrect lines, with their settings glitched out. the lines are on the right, circled in "refreshed" are the correct ones. I know it's probably hard to see, but noise option is not applying to the lines on the left.
To help make this a bit more clear, I've turned off the noise *Pattern*, which different from the noise edge.
Speculation: I'm currently not sure what is causing this, be it setting changes through the sizing / opac / flow bar on the left, or a possible weird memory leak - as this usually appears 'the next day' when I've picked up the drawing pad to draw again.
Sorry, lots of edits.