Put the summary of the bug you're having here
*What I expected to happen was...: Double trapped chests make one sound when opening and closing, like normal chests.
*What actually happened was...: Double trapped chests make two sounds.
Describe what happened here
Steps to Reproduce:
1. Make a double trapped chest
2. Open and listen
EDIT: The game needs to be saved and reloaded after the double trapped chest was placed, double trapped chests made during the same session do not reproduce the bug. (Thanks Nico)