Shillelagh homebrew help

I've created a staff that has a permanent Shillelagh spell cast upon it but I can't figure out how to make the damage show accurately. 

It's showing the typical 1d6 (staff) damage as well as the added or replaced 1d8 Shillelagh damage despite trying several different variances. 

For reference, it's the Staff of Vexation. 

Thanks in advance!! 💙

It is not currently possible to alter a weapon’s base damage die.

Well, that's silly. 😒

Thanks for the quick answer though!! 

they should fix that, fun-blocking me