IBook Registers wrong RAM size

Hello,
I have a weird issue with my iBook - I have the biult in 256mb ram and I installed a Crucial 1 gig stick in the other slot. It worked like a charm for a long time but recently I decided to run system profiles and it is showing that I have
"Memory: 768 MB"
What could be causing this?

Steven, I have not run the hardware test as I don't have a CD handy. I see there is memtest and techtool lite so I'll these.
Crucial will swap my memory free of charge so I'll do that first. It'll leave me with 256RAM for a little while which will be painful

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