I've had something similar happen after disconnecting the battery for maintenance, it was pretty shocking to see my 986 suddenly had 0 miles on it. It's happened to a few other people if you hunt through old posts.
If I recall correctly the fix is to disconnect the battery, insert the key and turn it to the first position, then reconnect the battery. I have no idea why it works, but it does fix it. Alternately, disconnect the battery and wait a few minutes, repeat, until it reverts back to the correct mileage.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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