Device breakpoint difference issue

Hello Developers, I am facing an issue related to device breakpoint. I have added 1440px device breakpoint in my design though my device is not 1440px and the changes I apply in 1440px are not updated in real 1440px device. It is instead shown in my device which is clearly not 1440px.

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Here in [section above footer] team section the image’s margin if updated in 1440px it will be updated in mine and not in 1440px.

Any views on this?