PropertyUtils.describe() returns wrong fields names

I have the following bean:

public class SumTestBean2 {
private int iVal;
public int getIVal()

{ return iVal; }

public void setIVal(int val)

{ iVal = val; }

}

... and the following snippet of code:

SumTestBean2 stb = new SumTestBean2();
stb.setIVal(12);
Map map = PropertyUtils.describe(stb);
for(Object o : map.keySet()) System.out.println(o);

.. prints out the following:
IVal
class
====
Note that instead of "IVal" there should be "iVal" - uppercase letter appears instead of lowercase.
This happens only when field has first letter - in lower case followed by uppercase letter.