Cave noises on 1.8 servers when Ambient/enviroment is off.

Ok, I am using 1.10 on a Server that supports 1.8-1.10. I believe this means that it is a 1.8 server that supports future versions using plugins. But, three times now I have heard cave noises, never have they been the same (There have been cave noise 2 and 10).

My ambient/environment is off, COMPLETELY, voice/speech is off, Music is off. Everything else is 100%.

I am not sure if this is a direct problem with the server (MinePlex) as bats even make ghasts sounds. I have tried making the cave noises work on other servers, but it seems only ones that support 1.8+.

(I hate cave noises, no disrespect to C418 they just creep me out ;3, and im dreading to hear cave noise 14, the glitchy cave noise that makes you think Mojang want you to think HeroBrine is real ;P).

Can anyone else clarify this with different servers running 1.8?