How do I make a touch joystick without problems?

Hi, i made a touch joystick, it works well, but i´m doing for make a mobile game so i used this tutorial: https://www.scirra.com/tutorials/1126/m ... ces/page-2

Now, when i touch on the joystick, the stick go to other position different than where i touched.

When i set parallax to 100, 100 the joystick works, but i need to set parallax 0,0 because this are controls.

This is the Capx: https://www.dropbox.com/s/2jc5rcunscpsj ... .capx?dl=0