yeah i didn't like that too, but she says that "there was ayakashi that can change size of target" also the girl that curses her was trying the time spell probably failed so it went temporally.
also if you guys don't know there is going to have anime of this manga too on 2009 hope this chapter is included since it is still 23
( to love-ru AR was chapter 85 so far then it didn't got animated
)