Mortgage lenders that sell loans to the government-sponsored enterprises are seeing a significant increase in the volume of buyback reviews on recently originated mortgages, according to a new analysis of repurchase activity disclosures by Inside Mortgage Trends, an affiliated newsletter. Through the first three months of 2013, GSE sellers had already repurchased some $80.6 million of loans securitized by Fannie Mae and Freddie Mac during 2012. That was more than double the volume of repurchases of mortgages originated in 2011. Loan quality didn’t deteriorate...