Custom inventory close event

Hi i created a custom inventory, when the players opens it it triggers the InventoryCloseEvent.
Is it something in my code or is it normal?

btw. The inventory opens just fine.

edit code:
https://github.com/hopstar/Hopstar.github.io/tree/master/src/bettertrading

 

@hopstar
It's kinda hard to help someone if they don't provide any code.

 

Il post the code in a sec, but my real question was if its get trigged also by opening the inventory?

 

@hopstar If they had an inventory open then I think yes, because to open your custom inventory their other inventory had to be closed

 

@SuchSwegMuchWow
Oke I don't know if they see the hotbar as an inventory but let say it it.
I also check if the name of the inventory starts with ID:
So this statement gets also trigerd as true.
EventLisetener : Line 302