Color balance difference between Mechanical Shutter VS Electronic Shutter - A7SII

[jamgamma]

I'm borrowing my friends a7sii to try out for some low light photogrpahy, and as I'm learning how to use it and testing it out, I'm noticing that there's a little color shift between the mechanical and electronic shutter (silent shutter).  My friend doesn't know why, and I can't seem to find the answer on google.  The only difference I saw on the settings was the DRO.  In the Mechanical Shutter, the D-R said OFF, but the Electronic shutter it said DRO-AUTO.  I turned the DRO-AUTO to OFF in the electronic shutter, and still, the color is different.

 

Does anyone know the answer to this damn riddle?

 

 

[thefsb]

in flickering artificial light, shooting with the silent shutter on an a7* can be very complex. (a9 is a different beast and i don't understand its shutter.) some lights change color as they progress through the flicker cycle so i can imagine that could throw the color meter off.