two front view windows are not equal

the view in (1) is not the same as in (2). why? i have pressed numpad-1 on both windows, but the result is not equal. and i didn’t touched numpad-5 for toggling an isomertic view.

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The perspective view changes with the position of the world origin in your viewport. Notice in the top image it is higher in your view than in the lower image. Go into front perspective view and pan up/down. The view changes but you are always in front view. This does not matter in orthographic views.

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thanks =)