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There is an unresolved set of conflicts for each level of the Hack and Slash perks. (HackAndSlash30/60/90)
Dawnguard adds Dragonbone weapons to each level of the perk.
Dragonborn adds exemptions for the perks affecting teammates in friendly fire hits.
The <acronym class="bbc ipSeoAcronym" title="Unofficial Dragonborn Patch">UDBP</acronym> adds the Nordic and Stalhrim weapons from Dragonborn to each level of the perk.
These cannot be reconciled without either a special patch or a unified Legendary Edition patch.