usps shipping

I have USPS as a shipping option and when I place 10 of the same item, each item is under .3 oz. in the cart and go to buy, it charge me $61.80 for soething that should be about $4.95.
I have 1.5 Nop Commerce software.

Any ideas?
Thanks

Is it possible your unit of measurement is set to POUNDS instead of OUNCES?

Under the product specs, no it is ounces. Otherwise, I did not see where you can change it. I looked through the files and scripts, as well.