Bug in either the spell Dark Ritual or Terror Wight's Dark Embrace

Dark Ritual says it gives 50% of that creatures stats to the caster, and Terror Wight’s Dark Embrace says it takes 25% of the creatures stats to the caster when an ally dies. My Terror Wight casting Dark Ritual on a target is giving me roughly 600-700 attack from Dark Ritual, and 150-200 attack from Dark Embrace. I’m not sure if these spells are supposed to take stats gained from artifacts into account, but it looks like Dark Ritual might be giving 100% stats instead of 50%.