From memory, this is a problem with the Adobe RMSDK that is used to render epubs. I haven't tested this recently, but I don't think it has changed. One of the links above has a suggestion to fix this for each book by changing the CSS.
Also, for a question like this, it is always a good idea to include the firmware version you are running. The firmware is the same across the Kobo devices, but there a plenty of changes between versions.
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