Tap light not shutting off?

I just noticed this morning on my kemper powerhead that the tap light is on. Meaning it's not turning off even though the unit is powered down. I tried turning the kemper on and then off again but it stays on. What's even weirder is that the light stays on even if I unplug the unit. Has anyone had this issue before?

UPDATE: after keeping it unplugged for 5-10 minutes, the green backlight finally dimmed all the way down. I rebooted, did some resets, turned it back on and the light seems to be back to normal. Not sure what happened....

Quote from Ingolf

Weird. How long does the light keep going unplugged. All the time?

I'm checking that now. It's a dim green color light...the tap works fine as it blinks in a white color.

It seems to be getting dimmer but I can still see something green lit up behind the button if I peek through the side of it.