Ghast fireballs move erratically when deflected with a Flame bow

Using a bow enchanted with Flame to deflect Ghast fireballs causes the fireballs to move extremely erratically. This doesn't appear to happen with any other enchantment for bows.

To reproduce, use a bow enchanted with Flame to deflect a fireball from a Ghast. If an arrow hits the fireball, it should deflect away in an erratic zigzag. See attached clip.