Chaos damage bypassing CI?

Hello everyone!

I'm running a CI build and I was curious about those purple balls, aren't they supposed to hit only chaos damage? If so, why sometimes when they explode they hit me for 3-4k througgh CI?

And no, it's not something else, I'm always staying in a corner annihilating all that spawns and leaving only the orbs to come to me as they (in theory) shouldn't do any damage at all.

Once per 3-4 maps they do inflict damage while the rest of the time they don't do anything (due to CI).

Does anyone have any idea if they are always 100% chaos or perhaps sometimes they get mixed with something due to affixes? The map I ran (where I took damage from them) is:




The orbs in question:

Are they hitting your shield? If so they’re not chaos damage. As to what type they are, fire damage indeed seems the most likely culprit; extra damage should be calculated before resistances right?