Hello,
I have exactly the same problem.:thumbup:
Config: High Sierra 10.13.6, 17G65
ASUS Z370 A PRIME, I7 8700, GTX 1050, RAM CRUCIAL DDR4 8GB CT8G4DFS8213, SEAGATE and Samsung for Drive.
But in fact, it's not very important I think, because every think works fine, but it's just curiosity.
So...