Assuming it's not DRM'd, you could try doing a conversion using calibre. I've found that's sorted out a few problems in the past.
I can't recall for certain off the top of my head, but I think you can use calibre to do a "conversion" from epub to epub, which would eliminate any problems arising from converting to and back from an intermediate format.
Alternatively, you could try editing the file using Sigil - or at least using it to see if there's anything obviously wrong on page 3 or 4.
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