HR Case got stuck in awaiting approval state

Hi All,

One of the user had created a HR Case from the navigator using "Create a New Case" module and entered all the necessary information on the required fields. After the case has been created it was stuck at "Awaiting Approval" state. No workflow had been attached or configured, also user can't able to resolve the case and there is no approvals tab on the related lists. Even we have checked in approvals table for the HR Case, there is no HR Case went for approval with that HR Case number. 

Please see the attached picture the first activity that we have seen on HR Case on "Comments & Work Notes" tab

Please help me what is the issue will be ?

Thanks&Regards,

Yamini