Early in the trading session, the bond market began improving in response to more updates on a potential Iran peace deal. When bonds improve, rates fall, but the initial reaction proved short-lived. 

Thankfully, the reversal didn't do any new damage. This allowed the average lender to keep rates right in line with yesterday's 6.61% for a top-tier 30 year fixed. You'd have to go back to May 14th to see anything lower.