Pencil brush doesn't align with pixel grid

Does anyone knows why I can't math the brush with the grid? I'm trying to make pixelart.

Attached is my config.

https://preview.redd.it/ivocxq3rdgch1.png?width=1916&format=png&auto=webp&s=0f07632d85d77fa6cb063e7fbf1cf0b1c3757695

https://preview.redd.it/zrw0xhusdgch1.png?width=339&format=png&auto=webp&s=fff0264cc942b6a4a85600311e3dd20cfe90ba58

https://preview.redd.it/eazb2n1wdgch1.png?width=1489&format=png&auto=webp&s=b18bc8648ce4a8e7e1d95d04a467aa19deb6cfe8