Missing Paragraphs

when i transfer books from Calibre to my e-book there is paragraphs missing at the end of some chapters. I am sorry if this is in the wrong section, i am new to this so please bear with me. I am wonderring if it is something i am doing or is there anything i need to install on my computer.

Thanks for any reply to my problem, i have a me-book.

Kind regards geordie-lad