I guess the flaw is only important enough for submitter to complain about, not to actually do something about. Most likely bad phrasing/understanding by submitter or developer.
When in IT, weekly I'd get a "My document won't print", when it sometimes gets traced back to "Actually, you can't open your document".
I've had problems with some open source projects, and between my explanation or the developer understanding, it was "can't reproduce". Then I submit a test case that repeats it all the time, and developer goes "Oh, that way. Yup, broken", and the fix comes in soon.