are you exporting using the "exclude unused files" option? That one causes issues if you don't reference the audio file somewhere in your RPG Maker project (plugins don't count)
try checking if these files were actually deployed alongside the rest of the game, or just disable that option if you don't care about the game being a little bigger in size
and also check that you're using RPG Maker supported file formats (.ogg and .m4a)
this app shouldn't be causing any issues like that so it's most likely something related to the above, but if none of these are the problem I'll try to help you sort it out