They shouldn't. Keep in mind that each block is 1/8th of a MB of data, so when using an approximation like that, it's possible that only a partial block of data was being used by the demo that, once deleted, didn't cause enough data to lost to round off another block. If you downloaded more content to your 3DS after getting the demo you have since deleted, I wouldn't worry about it. 1/8th of a MB isn't that much anyway ...
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Topic: Demo Help
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