Amid rising mortgage costs, the number of homebuyers backing out of contracts increased to record-setting levels in the last three months — especially in cities that were real estate hotspots through 2021, new data finds.

In August, roughly 15.2% of home purchase agreements in the U.S. fell through, after hovering above 15% the previous two months as well, according to new data from Redfin, an online real estate brokerage.