It is likely that you typed your whole book with double-spacing for the lines, like you were told to do for manuscripts.  EBooks don't use double-spacing, so we convert the whole thing to single spacing.  We keep extra spaces above the first paragraph of every chapter, and above the first paragraph of every scene-break, using vertical white-spacing for visual impact and clarity of the storytelling or information. 

It is likely that you typed your whole book with double-spacing for the lines, like you were told to do for manuscripts.  EBooks don't use double-spacing, so we convert the whole thing to single spacing.  We keep extra spaces above the first paragraph of every chapter, and above the first paragraph of every scene-break, using vertical white-spacing for visual impact and clarity of the storytelling or information. 

Important Fact!  

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Booknook.biz is the ONLY company on the Official Amazon Publishing Service Providers and Resources List located in the USA or even in North America. 
We've made more than 4,500 eBooks and hundreds of print books.

(See it for yourself: the Amazon Publishing Service Providers and
Resources List in their Help pages, right here:  https://kdp.amazon.com/en_US/help/topic/G201723120 )

Please note:  since the demise of Createspace, things are pretty whacky-busy here.  We try to answer every single email the same day that we receive it, and send out quotes within 24 hours, but sometimes, we're just slammed. Please be patient, but if you haven't heard back from us in 24 hours, please DO follow-up, because that may indicate that we did not receive your inquiry.  Thanks for understanding and being such GREAT customers.