Galapagos listener issue

I’ve problem with Galapagos Listener.

I would like to use Galapagos to minimize distance between points - in this example between two pairs of points. In addition I have to get as a result every iteration and fitness values.

In every iteration I should get 4 values; -X_1, -Y_1, X_2, and Y_2 iterations, as well as 2 values of fitness; Distance 1 and Distance 2.

Don’t know why, but I get in one iteration two lists of iteration values with 8 and 4 values, and 2 lists of fitness values with 2 and 1 values.