Most likely, it's because this line:

print INFO3 $s->att("<JOBNAME>",'JOBNAME',"\n");
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won't print any newline. This line maybe does:

print INFO3 $s->att("<JOBNAME>"),'JOBNAME',"\n";
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But I'm not familiar with XML::Twig. It strikes me as odd that XML::Twig would use <...> within attributes. Maybe your usage of XML::Twig needs some changes?