Wierd keyboard ! volume buttons turn down brightness??

Hi i have a macbook pro (early 2011) and it recently had a new logic board
and since then the key board has been acting strange ,The up volume key turns the brightness down ,only one shift key works ,keyboard brightness up turns up volume and screen brightness ??
also when pushing the buttons when typing they type the following ``` [[[===
has anyone got any ideas ?? or is it a case of taking it back to the apple store ?
any help would be appreciated Cheers

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Wierd keyboard ! volume buttons turn down brightness??

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