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ePubs use opentype fonts that will scale to any arbitrary size.
The majority of ePubs don't have an embedded font and so use the default font provided by the reader.
As long as the ePub is well-formed, the actual name of the css file has absolutely no impact on the rendering of the book.
In summary - this looks like a bug in the BeBook firmware, but it's impossible to say for certain without a lot more information. It's certainly not a bug with the ePub files.
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