All image objs will disappear at the same time

Applications
1

Code

The code block(s) should be between ```c and ``` tags:

static lv_obj_t * obj;
static lv_obj_t * obj5;

void lv_ex_get_started_1(int en)
{
if (en == 1) {

	static lv_style_t style;
   	lv_style_init(&style);

   	obj = lv_img_create(lv_scr_act(), NULL);
   	lv_obj_add_style(obj, LV_IMG_PART_MAIN, &style);
	lv_img_set_src(obj,&cec_charing_5);
	lv_obj_set_pos(obj, 200,10);


	static lv_style_t style5;
	lv_style_init(&style5);

	obj5 = lv_img_create(lv_scr_act(), obj);
	lv_obj_add_style(obj5, LV_IMG_PART_MAIN, &style5);
	lv_img_set_src(obj5,&cec_video_instruct);
	lv_obj_set_pos(obj5, 78,10);
}else if (en == 0) {
        lv_obj_del(obj5);
} else {
//do nothing
}

Here is my sample code. I can draw the two images(cec_charing_5 & cec_video_instruct) on screen when the “en” is 1, but when I set “en = 0” to call lv_obj_del(obj5) to delete “obj5”, the another obj will also disappear.
I also try to use lv_obj_set_pos() to move obj5 to another position. All the objs are disappeared on screen. It seems I cannot do any operation for any one of two objs. Once I did it , all the objs will disappear. Does anything I miss in the code?

I’m using V7.10.1 and runs on RTOS.

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