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Originally Posted by tonyducks
For some reason calibre is adding numbers in between paragraphs when spacing them.
Calibre does not add content to books. The numbers you are seeing are part of the PDF you are converting. You should read the sticky post at the top of this forum titled Read this before Posting PDF Questions
. The sticky posts at the top of calibre forums are full of pertinent information and should be read by all users before posting a question.