Epub format problem?

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http://forum.xda-developers.com – I used Calibre to convert my pdf books into epub format and then transferred them over to my N7. But when i use alkido or mantano apps to read them the book format has 2/3 pages on the screen?? I thought epub was the format of choice for using on the N7? Can someone tell me how I can get my books to display well as a single page while trying to read them as they are useless the other way above. Thanks. (HowTos)