PoE2 The Unborn Lich + CoC bug??? Am I missing something?

https://youtu.be/1R7Rir-bqp0 << here is the record

Explanation :

1. The skill I get from the staff (on right click) keep disappear when I load into new map
2. I can't use Cast on Critical on my mainhand and the tool said missing gem socket while I already socket the spell gem (but I can use it if I swap to second hand)

Is this bug or am I missing something ?

The video also include my item and skilltree