Fannie Mae and Freddie Mac reported sharply different earnings results for the first quarter, but at least one thing was mostly the same: both government-sponsored enterprises continued to push a significant volume of loans back to lenders through repurchase demands while carrying a large inventory of unresolved buybacks. “Some of our seller/servicers have failed to fully perform their repurchase obligations due to a lack of financial obligations in a timely manner,” Freddie said in its first quarter 2011 earnings report. As of March 31, 2011, the unpaid balance of loans subject to...