1) You're referring to the Mini-Log book on your vehicle profile page? Are you sure you're not sorting any of the columns? Try sorting by date.
2) After reviewing your Log Book, all but I think 2 of the 2014 Fuel-ups were marked as "Partial fill-ups". Once marked, Fuelly won't calculate MPG for that fuel-up or the next. More info here:
http://www.fuelly.com/faq/3/Why-do-I...all-the-way-up