Shoulder spikes == Shoulder horns? These spikes are sold separately so they support animations, which would not be possible if they were both combined to one accessory. To avoid any discussion, the price would be 250 if they weren't separated. Use the "Advanced" button in the Avatar Editor to wear both of them. Right variant: https://www.roblox.com/catalog/4571967579/Right-Shoulder-Spikes-of-Darkness
Data is not updated in real time. Most stats update within seconds or a few minutes.