[Issue] Replay sound by event 'Mechanim State Entered'

#1:
No, that's our workaround for when you couldn't add code to Mechanim itself. You should try using the MechanimStateSounds script instead, which you add inside Mechanim and gets called from the actual Mechanim events (state entered etc). The only drawback is that it only can play sounds and not do the rest of what EventSounds can do. Hopefully that will work better.

#2:
Your Audio Listener is probably to the left of the sounds. Double check the position of your Audio Listener vs the sounds position. If that is fine, then check out the 3D settings on the Audio Source of the sounds you are listening to at runtime. If you see anything weird there, let me know. There are various settings that are optional that you may have accidentally used?