Pretty much as it says in the title. Sometimes when selecting who to support me in battle it changes it to someone else after I clicking the start battle button, and its always seems to be to someone who I don't have friended so I don't get their eidolon effect.
Wouldn't bother me so much if it wasn't almost always on someone supporting me with Anzu when I'm trying to get more stuff from the dailies for it to switch and lose her Item Drop Rate + eidolon effect.