OK. Let me explain the problem messing with me.
I'm trying to put a missing Staff, i.e., Earth Staff, and this is really annoying now. The steps what I've been doing are as follows:
1. Open Stats Editor -> Stats -> Weapon, and Override staves-related things in my mod, namely, Test
2. Modify several values, e.g., putting ObjectCategory on WPN_Staff_Earth as "StaffEarth"
So the result must be as shown below:
[img]https://prnt.sc/gxvle0[/img]