I have a quick question regarding UPS module. I have it set as tare 0:0, I set the product at actual weight as well as 0lbs. The problem is for ground actual cost to ship from the area code entered to the location is about $6, the cost shown on the cart is just under $10. Is there something im doing to cause this large of a discrepancy?

When I go to ups.com and calculate the cost, the cost shows $7 for a 4lb product between two addresses. What is causing a $3 difference?