Claudia Ione Muhammad’s defense in Deutsche Bank’s mortgage foreclosure case was based on an anomaly in an allonge — a piece of paper attached to a negotiable instrument to provide space for additional indorsements — that accompanied the “adjustable rate note” the bank’s complaint included as an exhibit.Muhammad signed the $200,000 note and mortgage for a residence near Washington Park in Chicago on Aug. 19, 2005. But the allonge was reportedly signed by James Neukirch and referred …