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So if you think there is a problem with that line do something like this:
println valueOfArrayKey2Before
String ArrayKey2String = "" + ArrayKey2;
println ArrayKey2String;
See if you are getting...

What do you mean by that?
When should "Index" increment/decrement? What should cause the value of "Index" to change, and why is it not happening?

That, my friend, is the question. Why doesn't it? You have some opinions on what might be wrong. Add a few printlns to your code to verify your guesses.
If you think a method is not being called...