A workflow is sending the same email notification twice

A workflow is sending the same email notification twice. Not every notification, but this happening only a few times randomly.  The double sent emails are arriving together , have the same date and time.
I've checked the workflow and found that there is no double sending command in the workflow, and the workflow history also shows just 1 run and 1 email sending.
Can somebody help me on this.

Hi Neel,
For troubleshooting your issue, you can take steps as below:
1.Increasing the UserDefinedWorkflowMaximumComplexity to 30000 setting using Powershell script
2.IISRESET
3.Adding <httpRuntime maxRequestLength="51200" executionTimeout="3600" /> in web.config. Yes, that is "3600" unlike "300" suggested. Please note that there are multiple lines in web.config with <httpRuntime maxRequestLength="51200">.
I made this change only in the very first one.
4.IISRESET
5.Removed everything from C:\Users\<userName>\AppData\Local\Microsoft\WebsiteCache from my laptop
6.Removed everything from C:\Users\<userName>\AppData\Roaming\Microsoft\Web Server Extensions\Cache from my laptop
7.Removed everything from C:\Users\USER\AppData\Roaming\Microsoft\SharePoint Designer\ProxyAssemblyCache\ from my laptop
8.IISRESET
9.Restart SharePoint 2013 Designer
Reference:
https://social.msdn.microsoft.com/Forums/en-US/69b184bf-09ed-4e00-815a-4e40a975c4bf/prevent-sharepoint-2010-workflow-to-send-duplicate-emails?forum=sharepointcustomization
Best Regards,
Eric
Eric Tao
TechNet Community Support

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