AddExplosionForce makes affected object collide with everything at once?

Hello friends!

In my project I can throw a projectile (with Force) that I can also pick up again. The collision detection on the projectile is set to continuous dynamic. On collision with an enemy, the projectile becomes kinematic and after a timer the enemy explodes and emits an explosion force to nearby objects:

 private void OnDestroy()
 {
     if (projectile != null)
     {
         projectile.GetComponent<Rigidbody>().isKinematic = false;
     }

     Collider[] colliders = Physics.OverlapSphere(transform.position, explosionRadius);
     foreach (Collider inRange in colliders)
     {
         Rigidbody rb = inRange.GetComponent<Rigidbody>();
         if (rb != null)
         {
             rb.AddExplosionForce(explosionForce, transform.position, explosionRadius);
         }
     }
 }

IsKinematic is set to false so the projectile is also affected by the explosion. One or two (or sometimes a few more) frames after the force explosion is called, the projectile returns a collision with (almost?) every single game object in the scene including every other enemy; triggering a chain reaction of explosions. This, of course, is not a welcome feature... Other gameObjects affected by the explosion do not share this problem.

The projectile's collider has the size of a parentless cube with scale (0.02564212, 0.08199235 0.6880991). When I scale the projectile to be larger it seems to fix the issue, suggesting it might be too small for the physics engine to handle properly... But the force added to the projectile when throwing it does not create this problem and making it larger would be really inconvenient.
Is there a way I could make this work?