Nextion buttons activate in different place of the screen

hi, Im trying to solve this problem using the touch_j command in my NX4024T032_011 hmi. I insert this command in the preinitialize step. Then after I compile, load the tft code ,and reset the energy I see the “touch just” message and a coordinate circle at the left top of the hmi. Then I touch this circles and the circle move to another coordinate until appears the coordinate table of the four points. I don´t know if this is the correct form to calibrate. After I load the same code but without the touch_j commad. This procedure doesn’t correct the problem, mi code has many buttons and only some of this activate in the center, but other buttons activate when I touch in different place. Please can some one send me the correct procedure to calibrate this HMI.
Thanks very much
Regards