spawn actor transform(location) scale method

In Spawn Actor Blueprint, there is “Transform Scale Method”

and it includes ‘override root component scale’ and ‘multiply scale with component scale’

default is multiply scale with component scale.

I tried to spawn fire effect(unreal start content)

when compile with default method, spawned actor’s location changed to unexpected value.

so I changed the method to override root component scale
and it works.

I wonder how Multiply Scale works and why default option is multiply not override