Life stuck at lower than unreserved max

Sometimes when I cast my spell, my life total gets stuck a little lower than the health cost of my main spell and whenever I do anything else to change my life total, using Coruscating Elixir or a skill with lower health cost, it starts working again.

Life cost of spell is 75, when hp gets stuck its at 73, unreserved max life is 97.

I play with balbala to run Coruscating Elixir and I use eternal youth to recover life.

I can replicate it in my hideout as well, so no incoming damage that somehow stops eternal youth.

Sometimes it happens fast in succession, other times I can cast rapidly for a fairly long time before the issue arises.

I also see that it sometimes happens after coruscating elixir is used.

I also use Rathpith globe, but the same issue happens with/without it equipped. Tho without it equipped, it seems to lock at 83 out of 88 life for some reason.