What is the proper orientation for an overlapbox?

Hi there, after a good amount of searching I haven't been able to find out how to properly get the rotation of my overlap boxes set up.

I'm using it for damage calculation with a flamethrower. I have a trigger volume set up to map the size/coverage of the flamethrower's damage. Here's a little snippet for how I'm impementing it:

         Collider[] hitColliders = Physics.OverlapBox(thisCollider.bounds.center, thisCollider.bounds.size, thisCollider.transform.rotation, layers);
 
         for (int i = 0; i < hitColliders.Length; i++)
         {
             DamageCollider(hitColliders[i]);
         }

Damage is being applied just fine (every 0.5 seconds it calls the above code) and when my rotation for the parent player gameobject is 0,0,0, everything is hunky dory.

I tried mapping out the actual hit area with a gizmo cube using the same variables as the overlap box call, but ran into a problem where the following issue occurs:

First, at 0,0,0 rotation, everything is fine.

But when it's rotated at all, it goes like this:

Does anyone have any idea why this might be? Am I giving the incorrect rotation for the call, or do overlapboxes not actually rotate how I expect them to?