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Thank you all for you answers.
I did bunch of research on this and downloaded some free sample books on my kindle, and some of them had black "bars" or "backgrounds" on cover screen.
Spent so many hours to figure it out and last thing I did is to uploaded the book to KDP and download it again. It had black bars lol.
So to make it short, KDP is adding black or white "bars" based on cover itself. If cover is light, then it will be white and if cover it black, then "bars" will be black. They are adding it automatically...
Thank you all again!
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