Output is erroneous

[joshhansen]

Consider this code:

String a = "abcdefg";
String b = "bcdefgh";

NeedlemanWunsch nw = new NeedlemanWunsch(a,b);
nw.findSolution();
nw.printStrandInfo();

It gives this output:

bbcdefg-
-bcdefgh
The score for this alignment is: -4

This output appears to be erroneous. The source string does not contain the "a" but has an additional "b" not originally present.

I was expecting something like this:

abcdefg-
-bcdefgh