Some users are reporting an issue where the voices don't seem to match the corresponding line in the game. The developer is currently working on a permanent fix. In the meanwhile, they've offered up some temporary solutions to try.
1) When the issue occurs when using the mouse wheel to rollback through the game text, if you go back far enough through that character's lines, the issue is sometimes fixed. If it does get fixed, return to the point in the game where the issue first happened and after confirming that the issue is resolved, overwrite your save file.
2) Load save data at a point before the issue occurs.
3) Go back to the title screen and start a new game.
This issue will be resolved as quickly as possible. We apologize for trouble this may have caused.