You must have very observant eyes, I first saw it when the power on LED failed. I would assume it is normal, I have the same observation for several years on several of mine. My assumption is that it is leakage current that causes it to illuminate. Mine go out after the reset cycle is finished. It does not require much current to get a LED to glow dimly. For fun take a led and increase the series resistor until you cannot see it glow any more, the value will surprise you. Low room light makes it more observable.
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