They glow because even when your car is turned off it still sends a LITTLE bit of residual current through the lines. For a light bulb that takes more power to make light this will do nothing, but your LED's take next to no power, so the littlest current will make them glow for a bit, until that residual power is used up. This will not affect your battery in any way.
Sent from my iPizzle using magic and new fangled science stuff.
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