Some sounds were overwriting others and not letting them play

I expected to hear normal mc sounds as usual
ya know the ol' mc sounds we know and love

But I didn't hear the correct sounds that were playing at once
Some sounds were overwriting others and not letting them play and not be heard. For example: I can't hear the wither while I'm running on grass and there is rain: That was my example:

*Steps
Set all mc sounds to max and speaker sounds
make a world go into it play it for a bit
I got to this part. I built a house then My minecraft lags not FPS but Minecraft lag itself I would tp back and blocks took forever to disappear in gamemode c after I broke them.
Soon I left the world (So figure out how you can make your minecraft lag again, not fps lag...after you build something of course)
I relogged (So you relog
I turned my speaker sounds back to normal (mc sounds all stay at 100%)
I rejoined the world (so rejoin)
and My mc sounds were overwriting others PLUS the world didn't save!
Please fix and help!