Does it "reappear" if you run this command?:
/opt/splunk/bin/restart
If so, you havent set it to auto-start, and your computer is possibly restarting due to power failure, etc.
http://docs.splunk.com/Documentation/Splunk/6.0.8/admin/ConfigureSplunktostartatboottime
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First of all, open a support case with splunk so that they will fix this bug. Go to the CLI on the Forwarder and find the inputs.conf file that has this entry. Delete the entire stanza (but copy all of the text so that you can include in your support case). Save the file, restart the splunk instance and it will be gone.
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