The Fire Lord says hi. These shards are sold separately so they support animations, which would not be possible if they were both combined to one accessory. Use the "Advanced" button in the Avatar Editor to wear both of them. Right variant: https://www.roblox.com/catalog/5132159368/Right-Volcanic-Shards-of-Eternity
Data is not updated in real time. Most stats update within seconds or a few minutes.