Whenever i go to main menu this happens

[hearty mirage]

it’s the app or something

[hearty mirage]

Verify files game

[near quiver]

Do you have an addon that changes menu sound effects

[arctic kraken]

I think Gmod is using the wrong sounds for your menu

verify game cache, redownload Gmod

or do anything else that you think would help Gmod distinguish 2 files with the same name

[ivory cargo]

verify game files

or reinstall gmod

[haughty mountain]

redownload garrys mod