Took my car to America's Tire to get the wheels and tires rebalanced. When I got home I noticed that one of the wheels had the wheel weight adhesive on still but there were no weights anywhere on the wheel. So I called America's Tire back and asked when they do a rebalance and take off the old wheel weights do they leave the old adhesive on because I was worried that one of the weights might have fallen off while I was driving home. The guy at AT said that the adhesive was probably from the old wheel weight they removed and it was normal that some wheels don't need any weights. Is this true? Is there anything I should be worried about?