SYSTEM and @wksta$ are two different accounts, as far as I know.
so local system account showing as the domain computer account most likely is a bug in win8 itself.
http://technet.microsoft.com/en-us/library/bb680595.aspx
The Local System account does not have any rights to access the network. When network access is necessary, Local System uses the account Domain\computername$.
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KiXnet
