As you can see in the screenshot "Fire // Ice (Fire)" from Apocalypse is double and "Fire // Ice (Ice)" from Duel Decks: Izzet vs. Golgari is missing. Many other split cards are also missing e.g. "Alive // Well (Well)" and "Armed // Dangerous (Dangerous)".
A related bug is that if you click on "Other split part" only the name changes, but not the text.
Sorry for my bad English.