I had a customer today that had a very strange edge issue.
When he opened edge it would open twice, then it wouldn’t close, then it would spawn lots more processes.
It was very weird indeed.

So the fix is pretty simple though. Reboot the computer and run the following straight away.
Open command prompt and run

rename "C:\Users\%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe" "Microsoft.MicrosoftEdge_8wekyb3d8bbwe.OLD"

Then open powershell as admin and run

Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml” -Verbose}

Open edge and its back to its normal useless self.