Tested on Mod version Enhanced_Celestials-forge-1.18.2-2.0.6.jar & Forge version 40.1.16

This bug has been present since 1.16.5 as far as i remember:
Whenever you die during any of the 3 lunar events, the corresponding ambient sound will play another instance, causing 2 or more (depending on how often you die) ambient sounds to play at the same time. Currently this can only be fixed by quitting and reloading your world in singleplayer.
Haven't tested it on multiplayer but i assume you only need to reconnect to fix it. Also didn't test it on the new version but since there's no documentation of it in the changelog it seems the bug hasn't been noticed yet?
Really would appreciate it though if this bug could be fixed so we don't have to reload/reconnect every time we die during a lunar event. :)