If you ever spill even a little bit of brake fluid down there when bleeding or flushing your brakes, it is very hard to get out, it just seems to swirl around that lip and go under the edge of that cowling. I finally said enough and took off the cowling and got a toothpick and some of those blue paper shop towels and got it all cleaned up.
In the photo, your brake fluid looks overfilled (maybe you are on a slope). If overfilled I think it can come out the vent as others have said. I fill mine right to the bottom of the little triangle bump out above max.
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