So long story short the group I run runs JSRS & the JSRS USAF Sound Support as a dependancy on our server... However We allow for people to use Other "client side stuff" as well....
We've had issues recently where Half of us can hear each others weapon sounds where the other half cant. We've tried having everyone disable all external mods except for the 2 named above: JSRS & the JSRS USAF Sound Support
And still having the same Half and Half issue.

Check below for a Video showing what i mean.
https://youtu.be/L9jaN7Z_LCk?t=131