Potential Zarok Bug?

So before i leave a report, i wanted to ask here(idk where else to ask) if this is a bug or not.

So im running the Crit Spark Comet blood mage(its my 4th build, dont flame me) and decided to do Sekhemas, with an Against the Darkness vase.

Up until Zarok, no issues, all was well, when i got to Zarok tho, is where my issues occured.

First of all, my Spark was dealing damage to him, but leeching Zero health.

Secondly, i have 100% crit chance, but i was gaining no crit energy to trigger Comet.

Does anyone here have any insight as to why this occured or if im missing something?