To remove the extra Section Breaks, open up your original Word file on your computer and click to display the Section Breaks, and then scroll through your document and delete all of the unwanted Section Breaks. If you see extra chapter headings while reviewing your proof, it usually means you have extra Section Breaks in your Word document. To insert a Section Break at the beginning of each chapter of your Word file, put the cursor at the beginning of each chapter and select. A chapter heading will be created for every Section Break in your document, so only use a Section Break where you want a chapter heading to be created. Some tips for how best to format your Word document to improve the look of your eBook:

EBook Formatting Guidelines for Microsoft Word Documents