I'm betting your software is patched to use full screen mode. If so, there's this thread:
Kobo Touch - right hand margin cut off
That is resolved by this post:
Work-arounds for kepub problems in full-screen mode
It comes from the book's stylesheet:
Quote:
If the kepub book's stylesheet has non-zero margin or padding on the body element, then the text is shifted to the right, possibly resulting in text being cut off at the right hand side.
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If you update to the latest firmware, Kobo Firmware 4.12.12111, full screen is officially supported and that's likely the easiest way to fix the issue.
Hope that's of help.