Inventory Reserved Status

What does it mean if I shipped products to be fulfilled by Amazon and one sold and the rest of them say reserved???

Your competitor might have all of your inventory in their cart, or their facebook friends cart.

Several issues could be at play. That one is fairly common, second, amazon might have your stuff on a rail car taking the slow trip to another FBA location. I would not worry about it now, in a couple of weeks then maybe get concerned. They seems to be moving product by rail so expect time to grow.