Why static object's position changed when game start?

Hi,

I got a quite weird behavior of static game object. (Unity 2018.3.0f2)

There's 1 of the object in scene that set to be static. and when I click the play button.
,the position & scale of this object will change to be very far away from the camera view.

but if it set to be non-static, it will stay the same position.
This object & it's parent have no animation or any script to control its position. I can't find the reason why its position only change when set to static.

This is the video of the object I'm talking about ( it named Cube_Lava (1) )

anyone have an idea?

Thanks in advance & Best regards,
Bodin