Collider2Ds on projectiles are inconsistently triggering and colliding

Hello! I am experiencing inconsistent behavior using Collider2Ds to detect collisions and triggers on my projectiles. I will classify it into two problems. The first is that ocationally the projectile will pass through walls/objects it should collide with. The second is that ocationally the projectile will pass through enemies that it should "hit" with out hitting them. I will try to elaborate in detail below.

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A projectile is organized into a container Porjectile GO and two children GO: a PhysicsColliders GO and a HitBoxColliders GO.

The PhysicsCollidersGO job is to hold the colliders that define the solid regions of the projectile using Collider2D components. It's GO is on a Projectile layer which is set to collide with other solid layers such as the ones my walls are on. Walls are static colliders.

The HitBoxCollidersGO job is to define the a HitBox area. It's GO is on a HitBox layer and also uses Collider2D components that are set to be triggers. A HitScript on the GO listens for OnEnterTrigger.

Projectiles are set in motion by setting the velocity of the RigidBody once upon firing.

Here is a visual of the structure:

 ProjectileGO
  - PhysicsCollidersGO
  - HitBoxCollidersGO

Here are descriptions of the GameObjects and their components:

 ProjectileGO
   - RigidBody2D Component (collisionDetectionMode is set to Continious)
 
 PhysicsCollidersGO (Layer is set to Projectile)
   - BoxCollider2D Component
 
 HitBoxCollidersGO (Layer is set to HitBox)
   - BoxCollider2D Component (IsTrigger is set)
   - HitScript Component

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Problem 1. Projectiles will sometimes not collide with walls/solid objects/etc...

Problem 2. Projectiles will sometimes not trigger a hit.

Any ideas why?