Basically, when displayed in tree view, NBT entries which are not foldable, are not in line with foldable entries. In this example, "Inventory" compound is looking like it is a child of "XpSeed" integer, "EnderChestInventory" and "Skin" is a children of SelectedInventorySlot. Second image is photoshopped example of how to display tags without confusion.
Basically, when displayed in tree view, NBT entries which are not foldable, are not in line with foldable entries. In this example, "Inventory" compound is looking like it is a child of "XpSeed" integer, "EnderChestInventory" and "Skin" is a children of SelectedInventorySlot. Second image is photoshopped example of how to display tags without confusion.