CSS Doesn't Validate when combined, but does individually

I'm trying to validate the CSS here:
	http://openconcept.ca/blog

I don't know, how can this not validate:
 
http://jigsaw.w3.org/css-validator/validator?profile=css2&warning=2&uri=http%3A%2F%2Fopenconcept.ca%2Fblog

When the css files it is complaining about validate fine:
http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fopenconcept.ca%2Fmodules%2Fsystem%2Fdefaults.css&profile=css21&usermedium=all&warning=1&lang=en
http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fopenconcept.ca%2Fsites%2Fall%2Fmodules%2Fdate%2Fdate.css&profile=css21&usermedium=all&warning=1&lang=en

Can someone give me some pointers here?

Mike
-- 
Mike Gifford, OpenConcept Consulting Inc.
Free Software for Social Change -> http://openconcept.ca
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