i've tested this on two different systems and across two different characters. when i am running around in or out of combat, the system automatically and randomly switches weapons on me. i've tried rebinding the keys to no avail. i am playing on mouse and keyboard on both systems. one system is an amd laptop with nvidia 4070, and the other is intel desktop with nvidia 3080. my mouse is a razer basilisk v3 wired.
this becomes very problematic in busy or difficult fights as it can be difficult to shield block something when it switches away from shield to a grimoire. i had tried emptying my second loadout and that had no impact. the character would just randomly go unarmed in a fight.