I did my own Brush with my name as a Logo to my pictures. I create it as a brush template.
Should be only the letters with a transparent background. But allways if i insert the brush its insert a kind of a opac background in the size of my layer where i create the brush.
Mistake was probably done when creating brush, background wasn't 100% transparent and that was captured in brush. Try creating brush again but this time ensure that you have 100% transparent area around letters before saving brush.
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