Empowered Flame is doing too much damage.
The description on the Shard says: "Flamethrower Tower has a 15% chance to hit the target again for 180% damage."
My Flamethrower Tower is currently dealing 24,433 damage. When the Empowered Flame shard procs, it should do it's normal attack for 24,433, plus a second attack that does 24,433 * 1.8 = 43,979.
However, when it procs, I can clearly see the regular hit for 24,433, plus a second hit for 68,412. This is exactly 24,433 + 43,979, or 24,433 * 2.8.
So instead of hitting the target with a normal attackin, and then again for 180% damage, it is either hitting the target for it's normal damage twice plus a 3rd hit for 180%, or it is doing 1 normal attack plus hitting the target again for 280% damage. Either way, the result is that this shard is doing 100% more damage than it should be doing.