40V at Night from Solar. Victron charge controller feature or fail?

Since I installed the second solar charge controller, I see some mysterious voltage coming from my west roof solar during the night. Up to 45V for several hours. I can also confirm the voltage shown on the display with my multimeter!
Of course I do some investigation, checking out all possible causes and measure at different points of the system. I isolate the strings of my solar array just to find the voltage is even present with open circuits of my solar.
Is the charge controller faulty even it works normally during the day?
What is it???

Check out this mystery in the Victron VRM (click on Advanced to see the voltage curves):

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