The most common cause of this is that stdout and stderr are still open in the subprocess so reading the end of that/those "pipe(s)" doesn't get end-of-file until the subprocess dies (or closes stdout and stderr). So redirect stdout and sterr to a file:
$ssh->cmd("~/startup.pl >startup.log 2>&1 &")
If that still doesn't work, then you probably have an issue with controlling terminal and/or process groups so you'll probably have to "daemonize" the script (see "perldoc -q daemon").
(but my friends call me "Tye")
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