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Question: New Viewsonic VP2650wb - color variance from top to bottom

My brand new Viewsonic has a very noticeable variance in color from the top to the bottom of the screen. A large graphic will have a noticeably darker color at the top and gradually turn to a lighter color as you look toward the bottom of the screen. Is this normal or is it fixable? I'm new to LCD monitors as I retired my 20" Viewsonic of 12 years.