brush problem

Hello, could you post a screenshot of your interface when this happens, Cmd+Shift+3

also, please post the contents of Photoshop's Help>System Info... menu, so that we get to know your OS, its version, the exact version of Photoshop you are running, the date of the GPU driver, etc.
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Po zaznaczeniu obiektu i maskowaniu pedzel zostawia smugi, nie działa zacina się i zostawia piksele. Co mogę w tym wypadku zrobić?