It appears as though this may be the issue
It isn't, not with the code you posted, it has no nested subs, it shares no variables (unless the code you haven't shown does that)
A problem is with CGI->Vars , you never want to use CGI->Vars, CGI->Vars is for perl4
Also , return from main, exit after main
main( @ARGV );
exit( 0 );
or exit main( @ARGV );
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