Oil prices retreated Monday, as growing U.S. production and other signs of global oversupply keep thwarting a widely-expected rally. Monday’s downturn from overnight gains is the latest sign oil may continue to fall instead of rising toward $60 a barrel as many predicted, brokers and analysts said. Losses Monday would mark the sixth down session in a row for U.S. oil. It is now off 8.3% from the one-month high it hit April 11 and…