Powerbook 1.67GHz PowerPC G4 (17") - Memory upgrade

My Powerbook came with 512MB originally from Apple. I just bought another 512MB card from the Apple store, and after installing it, when I display "About this Mac" to check whether the installation was succesfull I see the following information:
SODIMM0/J20STANDARD.512MB DDR SDRAM PC1700U-25330 OK
SODIMM1/J23REVERSED...512MB DDR SDRAM PC1700U-25330 OK
Is it OK that the original card is "STANDARD", but the added one is "REVERSED"? What does it mean?
Everything seems to be working fine, but the word "REVERSED" concerns me.
Thanks for your cooperation
PowerBook G4 Mac OS X (10.4.7)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.3.9)
PowerBook G4 Mac OS X (10.4.7)

Having a RAM slot listed as reversed is not a cause for concern.
(16276)

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Hi BGreg,
I already reset the PRAM as you said.
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Which would seem to suggest that you may (unusually) have a doubtful memory module. Less unusually, you would have paid over the top for it.
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