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Does your calling script do anything after the script call?

What happens (as far as we can tell) is:
Main script calls script 2
Script 2
preforms action
exit 0 (success)
Main script can get...

Show your entire program, please, as well as the modifications you tried.

Because you are using 'exec', your original program ceases to exist and is replaced by this new one whenever you do so. It cannot return because there's nothing to return to.

If you don't want it...

remove the exit 0 line in the called script and wrap LoadMarkID.sh as follows

while 1 ; do
clear
echo "Enter L(Load id) M(Mark id) :\c"
read answer
case $answer in
...

PTL,
Skrynesaver and Corona688 both identified one third of your problems. (At least I assume that there is no command named invalid on your system.) You need to combine their suggestions to get...