Paint brush tool gives me unwanted pixels

I’m using the custom brush feature to make letters for a custom font, but when I go to put them all together on another canvas (to save time changing colors and such), I get additional unexpected pixels around the letters. Take a look at my screenshot: the right letter ‘A’ is what it’s supposed to look like but when I confirm the placement onto the canvas, it looks like the left letter ‘A’ with all the additional pixels. What’s going on?

Solved it. Turns out I had unused colors in my palette. One I got rid of them, the custom brush became clean. To figure that out, I went to Colors > Remove unused colors > Compact.

The reason was that you had Anti Aliasing enabled:

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