Data in returned object in wrong field

[Ollie]

I have an asychronous web services that returns an object. The object
contains three arrays: two string arrays and one object array. I am
experienceing weird behaviour when the first string array is empy and the
second contains data. When the object is returned, the first string array
contains the data belonging to the second string array and the second string
array is null.

I have yet to figure out why this is happening and any suggestions would be
greatly appreciated.

Olivier