The U.S. housing market is experiencing a sharp uptick in home sale cancellations, with nearly 15% of all contracts signed in June falling through -- the highest share for any June since at least 2017, according to new data released by Redfin. Just over 57,000 pending home sales were scrapped last month, representing 14.9% of homes that went under contract. That's up from 13.9% a year ago, as elevated home...