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omega/starterkits/*/css/YOURTHEME-alpha-default.css files all contain just this comment:
/* This file will hold styles that are loaded using the same media query as the narrow grid. */
That's the same comment that's in all the
omega/starterkits/*/css/YOURTHEME-alpha-default-narrow.css files. Based on how the default.css files are used, I believe this may be a copy-and-paste typo, and the comment should be something like:
/* This file will hold styles that are loaded using the same media queries as the narrow, normal, and wide grids. */