If there is a enemy with the deflecting enchant the damage done by an elemental arrow (thundering / flaming) is much higher then it is supposed to be.

as example. a bow with 2k damage + a thundering quiver of 60k dmg and no further bonuses to make the damage scale will reflect 5.000.000 damage back to anyone hit by the lightning part of the arrow. 

If you are grouped with a team it can instantly wipe you.

Included a video which shows the bug. Sorry if it is a bit slow. i just wanted to make it as clear as possible.
Highlighting the gear im using and damage reduction buffs im using ect.

Raw video directly was too big to upload. 
https://www.youtube.com/watch?v=WKOI36NHSqY