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...