Party/Other PCs Effects Volume at 0 but still hearing sage spells

[Cherishes]

Date & Time: 6 Dec 2021 11.50AM GMT+8
Frequency: Almost everytime
World name: Tonberry
Character name: Sun Rose

Class/Level: 88
Party or solo: Party
Area and coordinates: Syrcus Tower but probably anywhere

Steps:
1. System Configuration: Turn Party and Other PCs volume to 0
2. Have a sage in party use Physis (some other spells also work)
3. Hear sage sound effects when it should be silent