Localized Post Processing - SphereMask Transition Issue [Unreal 5.2]

https://www.youtube.com/watch?v=H3quOgfPplU

The Post Processing is supposed to be localized to the circle on the ground.
The problem is when I approach the location I can see the circle originating at some other location and moving into its intended location.

Does anyone know how I can prevent the unwanted transitioning as I approach?
(My PP BP is at the start of the attached video)

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