Add new weapon to actor in combat will make them sheath and unsheathe their weapon.

Any idea how to stop this? I could swear this was an issue in Oblivion but that there was a solution, but for the life of me I cannot remember what it was or find it in my Oblivion notes.

Could you clarify a little more please?

Is this similar to your situation?:

• You have an Actor equipped with a Steel Sword and a Steel Shield. You are fighting that Actor when you add another weapon. They then sheathe/unsheathe their Steel Sword.

Is this what's happening?