Double Trapped chest, makes two sounds when opening and closing.

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)