I am not sure if it is normal. Have you tried spot metering from something that is 18% (or thereabouts) grey. Grass for example. Do you have to change the exposure compensation then?
To tell the truth, the digi SLRs I have used (Canon 300D, 350D and 30D) have all tended to overexpose by about 1 stop so I was blowing highlights. However, I do think that this is because I tend to shoot contrasty subjects. To overcome the problem, I used to take a meter reading, and then underexpose by 1 stop using the camera on manual rather than any auto-modes. I always check the histogram as well rather than relying on the screen view.
About 3 months ago, (I had only had my 30D for about 1 month) it took a serious knock on some rocks and sand. Since then the meter has been out of calibration by 15 stops (according to my hand held meter), but I work around this by shooting fully manual now, taking an incident reading on a lightmeter and then checking the histograms to see how the camera is doing. I have to think a lot more about my photography which I am enjoying! One day I may get it fixed!!
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