Dupe

### Minecraft Version

1.21.11

### Plugin Version

1.6.1

### 📌 Bug Description

the stack editor thing u can dupe from it if u spam add all and leave the gui and join again 

https://github.com/user-attachments/assets/0c826534-923f-4c22-bf88-71e204a4a831

### ⚡ Steps to Reproduce

1. Start the server
2. Place a spawner
3. ...


### 📜 Logs or Errors (if applicable)

```shell

```