Virtual keys dont work properly in some rooms

[Dushi]

Hello guys,

I have GUI buttons made with virtual keys. How GUI looks: There are "layers" of GUI buttons. Layer 0 - base buttons, Layer 1 - buttons for units, Layer 2 - buttons for support stuff(but it really doesn't matter what they are for). So when I enter a room the layer 0 is shown. If I click on first button, the layer 0 will disappear and layer 1 will be shown. If I click on "back button", layer 1 will disappear and layer 0 will be shown. Same with layer 2. Problem: In some rooms it doesn't work properly(all rooms have same settings). I can't click on first button but I can click on second button for layer 2. When I click on "back button" for layer 0, it will not show layer 0 but layer 1(check step code below and you will understand why it should not happen). Using show_debug_message I found out that when I click on "back button" it will show layer 0(but human eye cannot see it) and immediately show layer 1. Check code:

Create event:

//Layer 0 - Base
guiBase[0] = spr_guiUnits;
guiBase[1] = spr_guiSupport;
//Layer 1 - Units
guiUnit[0] = spr_guiBack;
guiUnit[1] = spr_guiRifle;
guiUnit[2] = spr_guiOfficer;
guiUnit[3] = spr_guiFlame;
guiUnit[4] = spr_guiSniper;
guiUnit[5] = spr_guiMG;
//Layer 2 - Support
guiSupport[0] = spr_guiBack;
guiSupport[1] = spr_guiArtillery;
guiSupport[2] = spr_guiGasMask;
guiSupport[3] = spr_guiGas;
//Virtual Keys 0 - Base
    virtualKeyBase[0] = vk_numpad1;
    virtualKeyBase[1] = vk_numpad2;
    for(i = 0;i<array_length_1d(virtualKeyBase);i++)
    {
        virtual_key_add(64*i+64,304,48,48,virtualKeyBase);
    }

//Virtual Keys 1 - Units
virtualKey[0] = vk_numpad0;
virtualKey[1] = ord("A");
virtualKey[2] = ord("S");
virtualKey[3] = ord("D");
virtualKey[4] = ord("F");
virtualKey[5] = ord("G");
for(i = 0;i<array_length_1d(virtualKey);i++)
{
    virtual_key_add(64*i+64,304,48,48,virtualKey);
}
//Virtual Keys 2 - Support
    virtualKeySupport[0] = vk_numpad0;
    virtualKeySupport[1] = ord("Q");
    virtualKeySupport[2] = ord("E");
    virtualKeySupport[3] = ord("R");
    for(i = 0;i<array_length_1d(virtualKeySupport);i++)
    {
   virtual_key_add(64*i+64,304,48,48,virtualKeySupport);
    }

Step event:

if(keyboard_check_released(vk_numpad0)) and (!global.layer = 0)
{
    global.layer = 0;
    show_debug_message(global.layer);
}
else if(keyboard_check_released(vk_numpad1)) and (global.layer = 0)
{
    global.layer = 1;
    show_debug_message(global.layer);
}
else if(keyboard_check_released(vk_numpad2)) and (global.layer = 0)
{
    global.layer = 2;
    show_debug_message(global.layer);
}

Draw GUI units:

draw_self();
draw_set_halign(fa_center);
draw_set_valign(fa_center);
draw_sprite(spr_guiBackground,0,0,297);
draw_set_color(c_white);
draw_set_font(fa_pixelHead);
    draw_text(28,320,'$'+string(money));
    if(global.layer = 0)
    {
        for(i = 0;i<array_length_1d(guiBase);i++)
        {
            draw_sprite(guiBase,0,64*i+64,304);
        }   
    }
    else if(global.layer = 1)
    {
        for(i = 0;i<array_length_1d(guiUnit);i++)
        {
            draw_sprite(guiUnit,0,64*i+64,304);
        }
    }
    else if(global.layer = 2)
    {
        for(i = 0;i<array_length_1d(guiSupport);i++)
        {
            draw_sprite(guiSupport,0,64*i+64,304);
        }
    }

If I press numpad keys in there problematic rooms, it works well. EDIT: I know there may be problem with overlapping but why does it work in some rooms?