Incident Status auto changes to 'Open' from Resolved.

[SAS21]

Here is the flow: 

When the Analyst 'Resolves' the Incident an email goes to the requestor either to approve or reject the resolution. The hyperlink provided in the email redirects to the Service Portal. From the Service Portal user have the buttons 'Approve' and 'Reject'. When the requestor clicks on 'Approve' the status changing to 'Complete' but immediately in Native the status is auto changing to 'Open'.  Didn't find an issue in the Existing workflow and BRs but unable to figure out what is causing the issue.

Appreciate the Help!

Thank you.

[Mark Manders]

Did you check the widget code? You say this is done by a button from the portal, so I would start there instead of looking into BRs or (work)flows, since it's probably a misconfiguration in the portal widget.