Doing no damage sometimes

Like title says i have this strange behaviour and i have no idea why is that. https://www.youtube.com/watch?v=byGITTOoKx0 There is video that can clearly see.
https://pobb.in/cPwtDpQjCuPs and there is my skill tree atm. I have no idea what causes this. If you can help me please do and would be appreciated.

Brutality support allows your Cyclone to deal physical damage only. Unholy Might buff you occasionally get converts all physical damage to chaos damage.

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MonaHuna#6449 wrote:

Brutality support allows your Cyclone to deal physical damage only. Unholy Might buff you occasionally get converts all physical damage to chaos damage.

Thanks for help :) That answer was working :)