Hero background would not change for all screen sizes scaling up and scaling down?

I’m editing a hero image. With the same class name in the template.
When I edit it in the base start view port and go to the smaller mobile size it retains the same original template image and not the update background image.

Any idea why the hero background would not change for all screen sizes scaling up and scaling down?

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Common point of confusion in Webflow. Their “base” viewport is the one with the star and laptop icon.
When you add wider breakpoints, the styles cascade upward from the base.