If the HCI came from reforging, it is possible that it's weight is wrong. There was a bug that made it impossible to reforge 25 HCI on ranged weapons. They've fixed it, but it is likely that it is being given a wrong weight after reforging.
Try to imbue the piece again, pick HCI and select 25% to see what weight the imbuing gump will show. If it shows the correct 430, you will have to cave in and burn those relics to imbue HCI again on it.