Are you sure you are creating additional tables and not chains? See for example: https://askubuntu.com/a/316993 https://askubuntu.com/a/316993 The post further

Are you sure you are creating additional tables and not chains? See for example: https://askubuntu.com/a/316993 https://askubuntu.com/a/316993 The post further down there says that additional tables can only be created via the kernel, so if you're really creating additional tables could you please share your commands for doing so?