That's pretty normal with a 3% gacha rate, especially considering the 3% chance of SSR has a significant chance of an SSR weapon with NO kamihime in it at all (god that would be such a waste).
In my 30 pulls from the jewel gacha (2x10 pulls from magic jewels and 1x10 pull from nutaku gold gacha with identical rates) I got two SR weapon with no kamihime associated at all and a duplicate SR weapon for Cronus (I already owned her, so I didn't get a second version of her from the second glaive I pulled). RIP.
If I didn't get Shiva I would have probably quit the game already honestly.