IMHO it looks like a format issue to me. This is what I would try if it was me.
Convert the epub, to a txt file using calibre. Once converted I use Edit Pad Lite to open it, its free.
http://www.editpadlite.com/
Go to the top of program, Click on extra, select remove blank spaces. Close and save. Then convert the repaired txt file back to epub.
Had a epub that look just like that. Thats how I fixed mine. Hope that helps.