Automatic calculating of shipipng

[ristretto6]

I've entered all my shipping rates (mine is tiered by weight) and am testing it out by putting items in my cart in the storefront.  It adds up the item totals correctly, but doesn't register that there are any shipping costs, even though I inputted that each item weighs 0.5 lbs when I was entering them as new products.  Shouldn't it calculate that this would be 1 lb. total, and assign it the shipping rate for my 0-1 lb. range?

 

Is there another setting I need to add that I'm overlooking?

Thanks!