Same here, if I am not mistaken, there are more devotional candles in the Orthodox churches and it must have been packed that very day for the Orthodox Easter Sunday, so more candles had been used.
In my church, and I am Catholic, we have just one devotional candle light stand, but even on candle is enough to start a fire.
Saw a thread from one of the local tv stations of what that church looked like before the fire, with its very beautiful icon screen, sadly, all gone now.
Correction: One candle.