weird pencil brush behavior

[DearDeparted]

[attachment=9735]
i currently use the "pixel (1x1)" pencil brush to draw with. with this brush, most brush sizes look somewhat off. its most noticeable in the 2px brush, although you can still see the problem in other sizes. it looks all jagged and messy, see attached screenshot
i might be simply missing or overlooking something, im not too familiar with the way brushes work in gimp
any help to fix this is appreciated!

[Ofnuts]

The 1x1 pixel brush is really meant to be used at 1px size, with the pencil and not the paint brush. And you want to upscale it, use only odd numbers (3x, 5x....). The spacing of 1% isn't helping either (on such a brush, it should be 100%).

There are much better general purpose brushes so why this one?