"H" or "I" beams have always been a disaster to try and tie down properly. When the shipper bundles them together, the tighter you try and tie them down (I always use chains instead of straps on this kinda stuff) the beams always shift. The only way to move them without a lot of fear of them shifting is to place dunnage between each one and stretch your chains so tight they're almost welded to the deck, loading them tight to a headboard is a good idea too. Even them they can still shift as evidenced by your pics. Glad your driver wasn't hurt, he or she needs to go buy a lottery ticket.