I never realized it’s on there. But my first feeling is that that’s vanilla Wanikani and I haven’t used it so I can’t say much. You should have it as well??
If not, I’ll try to look at which script is causing this, but in any case. I think??? that the Self-Study Quiz has an audio quiz option?
You can check which scripts I have on this blog, with what they do and so on. There are many ways to improve on your WK experience if you want to.