Yep....happened to us as well. Definitely an "OH SHIT!!!!" moment!!
The air flow across the hood creates enough lift that around 45-50 mph the hood will be raised and block your line of sight. Now, every time I close the hood I also push down on the hood, over the area of each hood latch. Simply letting the hood drop from a good height is not always enough to ensure all the latches engaged every time!!!
I've definitely learned from that and also never trust someone when they give you the keys and say here you go its ready to go.
RNJ12