Despite a third-quarter earnings beat and a viral marketing campaign featuring mega stars, American Eagle Outfitters Inc. (NYSE:AEO) is flashing a potential warning signal in its underlying fundamentals.Check out AEO’s stock price here.AEO Stock Soars, But Fundamentals Flash WarningWhile the stock price surged following the earnings report, Benzinga Edge’s Stock Rankings data reveals that the company’s quality score has deteriorated, dropping from the 12.22 percentile to a troubling 3.05 percentile week-on- ...