A spriter animations is made of parts, Maybe be your "parts" have a wrong hit box, but I don't think it's a good idea to rely on Spriter animated "parts" hitbox, and I don't you can manage a correct collision system for the player with that many hitboxes moving.
Since the wrapper sprite can't have a hitbox, I immediately prefered to make the whole Spriter animation stick to a single invisible sprite (with function Pin for example) wich is actually the real player controled sprite, then I can define a hitbox like usual. For sure this hitbox won't adapt to each different frame of the Spriter animation, this way you have to keep a "global" hitbox for this character, but is it really a problem ? This way, this is functionning just like usual in Construct 2, Spriter only take care of a visual animation.