Great job getting hold of these and reporting on this. It looks like they should seriously consider ditching these and going with good old cheap, dirty, reliable steel beams.
Seems to me that some people should be looking for a new job. Why would you accept patently defective material? Oh. I know. It's not your money. (sarcasm) Bazinga.
Apparently, the substandard pieces showed up and there were no more available so the substandard pieces had to go in so that the bridge could hurry up and be open, not waiting for more pieces to be fabricated. Yes, go with the old-fashioned but make sure it is US steel.
DVH. First to the scene, last to leave.