Originally Posted by mikelv
I checked the epub you mentioned. The problem occurs because the main page is missing in the navmap of the epub. So it's not EPUBReader's fault
If you don't display the flow, it is EPUBReader's fault.
navMap is strictly for the TOC, any EPUB compliant reader should follow the order of the flows as defined in the spine of the OPF file, and only display the flow if it doesn't have a linear attribute or if linear is set to "yes".