Thanks for playing. That is very strange. The object in your screenshot is not even a 3d object its just a basic sprite why it shown as a default gdevelop 3d texture I have no idea. I don't know which browser you use, but it might be related to gdevelop itself and the browser. Even in chrome, sometimes sounds are not properly loading while playing the game on itch.io. ofcourse simple refresh solves most of the problems.