Shipping Not Updating with Carrier Rates Activated

Hi,> > I am trying to get my shipping rates correct. I have added my Canada Post and UPS accounts in hopes to get accurate shipping rates but that doesn’t seem to be the case. Not sure if I’m missing something. If I add 1 item or 10 items to the cart my shipping rate is the same. I can manually update by adding different weight incriminates but then I how do I get the carrier rates. Just seems like I’m guessing? If I can please get some pointers please? Thanks