Firestorm hit register bug

https://www.youtube.com/watch?v=pJ9nZ9eqFSs

I've noticed that, while playing Firestorm Totems, occasionally it will appear as though an instance of Firestorm does 0 damage to something it hit straight on.

In this video, I go through the entirety of Maligaro's Sanctum, and there are a few instances where it appears Firestorm did 0 damage to an enemy that was hit by the meteor.

The video is a bit fuzzy, but the most glaring example of what I'm talking about is at 3 minutes in. You'll see me point my mouse (angrily) at the Undying Inductor enemy that is hit by multiple meteors directly while seemingly only taking damage from a small ignite inflicted earlier. Immediately after that, a Scalding Arachnid appears to be hit a few times directly by meteors without taking damage.

This bug appears to occur randomly

https://www.youtube.com/watch?v=znHiYXmwywo

In this video, there aren't any doubts: for some reason, Firestorm deals 0 damage in specific circumstances. I haven't changed any gear between these two videos. The bug appears to be consistently repeatable in this area, so perhaps finding a fix for it would be easiest by looking in there?

Doesn't have to do with the zone you are in. Checkout this post for my video https://www.pathofexile.com/forum/view-thread/3363237

Seems to just be a situation where multiple "airborn" Firestorms are possible at the same time cause it to go over the 3 firestorm limit in some unintended way?

Same here. I have a lot of cast speed, like, a lot. With 3 totems the damage stop registering. Probably some limit in cast quantity