Hmmm. Your code works for me under Linux. Some other suggestions:
It's not just that the files ending up where you expect? The contents of ABC are going to the home directory. If your intention is to replicate ABC directory. You'll need to create it and cd to it yourself:
$ftp_obj->mkdir('ABC'); # make sure the directory exists
$ftp_obj->cwd('ABC') || die $ftp_obj->message;;
Set Debug => 1 when you open the ftp object. It'll give you lots of useful debugging info.