I've been following this Guru tutorial, and I'm getting some unexpected behavior in the texture painting section. If I move the paintbrush on the left, the marks left behave in a "sensible" manner: without being able to articulate all the unwrapping rules, drawing a line along the default unwrap draws a line along the outside of the doughnut.
However, whenever I try to draw on the doughnut itself, a swipe across the outside of the doughnut does this:
which does in fact leave some strokes on the outside. I already tried to use the default "uv unwrap" setting but it has no effect.