Because all the items had the green square meaning they are in stock. I purchased it from this company aquacomputer.
I did a quick Google translation and " nur noch wenige am Lager" means: "only a few in stock.' So that essentially means in America that they usually stock it, but they are subject to prior sale. So I suspect that not all your items were really in stock at the time of purchase. That's why if i am in a hurry for something I would call and verify whether something was in stock or not. At this point you can only call or email Aquacomputer customer service to find out what they have or don't have.