question about json file

[gxu12]

Hi,
I found for different teeth json files, same instances are related to different labels, for example , if I have label = 9, sometimes it is related to instance = 43, sometimes it is related to instance = 34. So is there any logic between label and instance?
thank you !

[TousenKaname]

Hi! Do you know the logic? I`m confused either