You must set the options of 'x' => 0, and 'y' => 0 to another values for each widget, casue it the position and if it the same the widgets are positioned in the same place...
ex:
'x' => 2,
'y' => 2,
must position the widget in second place
ex:
'x' => 2,
'y' => 4,
third place etc...