AVS not working ?

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 Hello - I hope you can help with my AVS problem.  Authorize.net is working fine if I input an incorrect credit card exp date, number or CVV code.  It will not authorize any transaction with those fields being incorrect. 
However - it does not seem to be processing any of the important AVS info - street # & zip code.   I can input any address (with a valid credit card) and it will approve the transaction.  Of course I have the AVS settings set to check zip & street address for a match within the Authorize.net website settings.  Any ideas to help would be most greatly appreciated!  Thank you.  D