Fake errors in CSS validator?

Dear Administrator,

I'm Imre Bertalan and writing to you about a question of the CSS validator
and Laravel5 connection.
We here at Bit and Pixel, nowdays using Laravel 5 based websites. Also
started using Jenkins as a CI and we wished to implement a HTML, CSS
validator in it. The most obvious was to use the W3C validating tools via
the Unicorn plugin for Jenkins. However it didn't give the results we were
hoping for.
The website http://laravel-skeleton.bitandpixel.hu/ is up'n running without
any errors. But when I try to validate it with W3C's CSS validator, it
gives me a lot of errors. 83 to be precise. But we think these errors are
not real errors and the validator is not showing them as correct errors.

Can you please look for yourself at the website and try to validate it? Do
you think these errors are real errors that needs to be fixed somehow (our
developer said these are not errors at all) or they are just bugs in the
validator?

Thank you for your answer in advance!

Best Regards:
Imre bertalan

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Imre Bertalan
SystemOperator
Bit and Pixel Kft.
+36 30 650 1760
bertalan.imre@bitandpixel.hu