GUI will only Work for Newest Towers and I Don't Know Why. (Gamemaker)

Question

I have a problem where in a game. when I make in a place the first tower the GUI works fine, but when I place the second tower the GUI only works for that second tower, and it just goes on and on for each newest tower my place.

Step Event:

if placed != false
{
    image_alpha = 1;
    
    if collision_circle(x,y,200,oEnemy,false,true)
    {
        if instance_exists(oEnemy)
        {
            target = instance_nearest(x,y,oEnemy)
            if target.x < x
            {
                direction = point_direction(x-18,y,target.x,target.y);
            }
            else
            {
                direction = point_direction(x+18,y,target.x,target.y);
            }
            if alarm[0] = -1
            {
                alarm[0] = 60;
            }
        }
    }

    if mouse_check_button(mb_any)
    {
        if !position_meeting(mouse_x,mouse_y,self)
        {
            GuiOpen = false;
        }
        else
        {
            GuiOpen = true
        }
    }
}
else
{
    x = mouse_x;
    y = mouse_y;
    image_alpha = 0.5;
}

if GuiOpen = true
{
    instance_create_layer(x,y-65,"Instances2",o_Tower1Upgrade);
}
else
{
    instance_destroy(o_Tower1Upgrade);
    instance_destroy(o_tower1upgradebutton1);
}

I tried my best to figure out the bug but i really just can't, theres no errors in the output or anything i could find thats wrong with my code.

Answer 1

Instead of position_meeting you might wanna try instance_position. The reason for this is because "_meeting" means if any object of that type will fullfill their role, rather than the specific object you want to get.

Source: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Reference/Asset_Management/Instances/instance_position.htm

I based this off a similair experience I had with place_meeting and instance_place. The problem and solution looks pretty similair: https://gamedev.stackexchange.com/questions/158359/when-there-are-multiple-objects-of-the-same-type-how-do-i-know-which-one-i-am-c