In this Investopedia article,
For example, when the Federal Reserve increased interest rates in March 2017 by a quarter percentage point, the bond market fell. The yield on 30-year Treasury bonds dropped to 3.108% from 3.2%, the yield on ten-year Treasury notes fell to 2.509% from 2.575%, and the two-year notes' yield fell from 1.401% to 1.312%.
I know that interest rate and bond price are negatively correlated: if interest rate goes up, bond prices drops. Also, for a given amount of coupon earned on each period, if the price drops, the yield should increase instead of falling. What is wrong here? Thanks.