NAV Injury Rejection lol

So I have been home since December waiting for medical treatment for some pretty serious injuries that happened at work in late November. I work in a warehouse, and one day, I was going to grab a 40 lbs box that was above my head, while standing on a ladder. The stack of boxes was uneven due to my knowledge, and they all fell towards me. I managed to catch a box that fell off the top to prevent it from hitting me, but it blew out my shoulders, and injured my back. I probably need surgery on both shoulders as proven by MRI. Still waiting on MRI for back. These may be lifelong injuries, really hoping they're not. Sick of sitting at home waiting already. Anyway, NAV just rejected my work injury comp claim saying they don't see it as an accident. I want to see anyone else stand on a ladder and maintain balance while unexpectedly catching a 40 lbs box from 4 ft above their head. How can you not call that an accident? It's definitely not a controlled situation. Could it be a communication error? Am I missing something here?