Back to root_menu in script doesn't respond like it should

Menu and its submenus in single file bash script with a back to root menu for each. --- My issue is that the show_root_menu call sometimes just jump to the upper menu instead of the root. Bash-installer-menu . It goes most often wrong with the nvidia submenu, to get back to the root menu. Instead it goes to the "Package options" show_pckg_menu, when "show root menu" is selected from the "Install graphic proprietary driver" submenu: --- --- My ohter related questions resolved so far: - https://unix.stackexchange.com/questions/733152/whats-the-difference-between-sh-command-and-run-as-executable/ - https://unix.stackexchange.com/questions/733425/creating-debug-of-a-bash-script-menu `$ shellcheck myscript No issues detected!` The actual script is:

#!/bin/bash
show_root_menu(){
width=72
height=50
menu_height=8
backtitle="Installer-menu"
title="Setup opions"
menu="Choose one of the following options:"

options=(1 'Add Mint PPA and update' 
         2 'Install Cinnamon '
         3 'update and upgrade '
         4 'Additional software installation '
         5 'Upgrade Kernel '
         6 'Resolve Ubuntu Cinnamon issues '
         7 'Install graphic proprietary driver'
         x reboot
         q quit )
    
result=$(dialog --clear \
                --backtitle "$backtitle" \
                --title "$title" \
                --menu "$menu" \
                $height $width $menu_height \
                "${options[@]}" \
                2>&1 >/dev/tty)
}
show_pckg_menu(){
width=72
height=22
menu_height=8
backtitle='Installer-menu'
title='Package options'
menu='Choose one of the following options:'

options=(1 'Install package list'
         2 'Export package list'
         3 'update and upgrade'
         4 'Show root menu'
         x reboot
         q quit )

result=$(dialog --clear \
                --backtitle "$backtitle" \
                --title "$title" \
                --menu "$menu" \
                $height $width $menu_height \
                "${options[@]}" \
                2>&1 >/dev/tty)
}
show_solver_menu(){
width=72
height=22
menu_height=8
backtitle='Installer-menu'
title='Resolver menu'
menu='Choose one of the following options:'

options=(1 'Network applet problem'
         2 'Sound problem'
         3 'update and upgrade'
         4 'Show root menu'
         x reboot
         q quit )


result=$(dialog --clear \
                --backtitle "$backtitle" \
                --title "$title" \
                --menu "$menu" \
                $height $width $menu_height \
                "${options[@]}" \
                2>&1 >/dev/tty)
}
show_nvidia_menu(){
width=72
height=22
menu_height=8
backtitle='Installer-menu'
title='NVidia driver selection'
menu='Choose one of the following options:'

options=(1 'Install nvidia 515'
         2 'Install nvidia 525'
         3 'Update and upgrade'
         4 'Show root menu'
         x reboot
         q quit )

result=$(dialog --clear \
                --backtitle "$backtitle" \
                --title "$title" \
                --menu "$menu" \
                $height $width $menu_height \
                "${options[@]}" \
                2>&1 >/dev/tty)
}
show_root_menu
case "$result" in
    1)	echo 'Mint backport repos installed';
    	apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A1715D88E1DF1F24 40976EAF437D05B5 3B4FE6ACC0B21F32 A6616109451BBBF2;
    	sh -c 'echo "deb http://packages.linuxmint.com  vanessa main upstream import backport romeo" >> /etc/apt/sources.list.d/mint.list';
    	sh -c 'echo "deb-src http://packages.linuxmint.com  vanessa main upstream import backport romeo" >> /etc/apt/sources.list.d/mint.list';
    	apt-key export 451BBBF2 | gpg --dearmour -o /etc/apt/trusted.gpg.d/mint.gpg;
    	apt update;
    	show_root_menu;;
    2)	echo 'Installation of Cinnamon';
    	apt install slick-greeter muffin cinnamon;
    	show_root_menu;;
    3)	echo 'Package upgrade';
    	apt update && apt upgrade -y;
    	show_root_menu;;
    4)	show_pckg_menu;;
    5)	sh ubuntu-mainline-kernel.sh;
    	show_root_menu;;
    6)	show_solver_menu;;
    7)	show_nvidia_menu;;
    x)  echo Reboot;
     	reboot;;
    q) 	clear; 
    	exit ;;
esac

show_pckg_menu
case "$result" in
     1) echo 'Package Install';
     	sh installpkgs.sh;;
     2) echo 'Manualy installed packages exported';
     	sh pkgsexport.sh;;
     3) echo 'Package upgrade';
     	apt update && apt upgrade -y;
     	show_pckg_menu;;
     4)	show_root_menu;;
     x) echo 'Reboot';
     	reboot;;
     q) clear; 
     	exit ;;
esac

show_solver_menu
case "$result" in
     1) echo 'Applying changes to network settings';
     	clear;
        option_picked "Option 1 Picked";
        touch /etc/network/interfaces;
        sh -c 'echo "auto lo" >> /etc/network/interfaces';
        sh -c 'echo "iface lo inet loopback" >> /etc/network/interfaces';
        sh -c 'echo "  renderer: NetworkManager" >> /etc/netplan/*.yaml';
        netplan apply;
        show_solver_menu;;
     2) echo 'Applying changes to sound settings';
     	ln -s /usr/share/pipewire /etc/pipewire;
        touch /usr/share/pipewire/media-session.d/with-pulseaudio;
        systemctl --user restart pipewire-session-manager;
        systemctl --user start pulseaudio;
        show_solver_menu;;
     3) echo 'Package upgrade';
     	apt update && apt upgrade -y;
     	show_solver_menu;;
     4)	show_root_menu;;
     x) echo 'Reboot';
     	reboot;;
     q) clear; 
        exit ;;
esac

show_nvidia_menu
case "$result" in
     1) echo 'NVidia driver 515 installation';
     	apt install nvidia-driver-515 -y;
     	show_nvidia_menu;;
     2) echo 'NVidia driver 525 installation';
     	apt install nvidia-driver-525 -y;
     	show_nvidia_menu;;
     3) echo 'Package upgrade';
     	apt update && apt upgrade -y;
     	show_nvidia_menu;;
     4)	show_root_menu;;
     x) echo 'Reboot';
     	reboot;;
     q) clear; exit ;;
esac