"stack size of simulacrum splinter" modifier doesn't work?

I actived "would you like to see my face?" in delirium skill, so when i found simulacrum splinters i got two of them. so far so good.
But when i manage to stack my waystone modifier by using Destilled Despair and tablet to 100+% increased stack size of simulacrum splinter, i still got 2 of them each time.
Shouldn't it be 3-4? Is that wrong or i was misunderstanding?