Hi SandPixie!
Sorry for the late reply! So yeah, Nymrod is kinda also explaining the base issue, and now I know exactly what went wrong.
TMI, but Renpy lets you set what audio channels certain sounds play from. There's a music, voice and sfx channel etc. (I think there might be others, but not sure). Unfortunately it sounds (no pun intended) that the CTC click sound, is linked to the SFX channel...but so are the voices...which they shouldn't have been.
It's an easy fix but rebuilding it rn, would eat alot of time. Unfortunately too much to fix something that is more of a "preference" than a bug intrinsically. I hope you understand!