Hi, ignore the fire on the crates, this is happening because of the error you are experiencing.
To be able to find your issue is difficult from here, it will need some work on your part. Nobody else is having this issue, so something on your server is causing this. It could be another plugin causing a conflict or something else.
What other plugins do you use that interact with the Helicopter in any way, whether it directly alters its settings, or interacts with the heli loot, or gives points or records heli kills etc?