Mine do this too.i installed some LED's in my car. but noticed they stay dim when i turn them off.. i googled around and it seems common for LEDs.. anyone else's does this ? its just so faint youd have to take the plastic cover off to notice it.. apparently itll completely turn off but only after 10-30 minutes. only way people seem to have fix this is with high quality LED or adding a resistor.. since the LEDs i got were 10$ for 10 im sure they arent that great but in the car they look awesome.
let me know!