It's based on the TVDB. The mods there refuse to change it because ABC Family's episode guide lists "We Love You to DeAth" as episode 13 rather than a special. I suggest complaining to ABC Family about how they label their episodes.
@gigaberry This is just a note from the future, to say that TVDB's mods are still just as obnoxious, stubborn, and logic-resistant as they were back in 2015.
Shout by @Cesar_NVIP 11BlockedParent2014-12-18T12:34:47Z
The Season 5 episodes list it's all wrong!!!
"We Love You to DeAth" it'a a special! It's not the 5x13! "How the 'A' Stole Christmas" it's the real 5x13 and not the 5x14! And finally "Through a Glass, Darkly" it's the unaired 5x14 episode and not the 5x13"!
Please fix it!