How did you do that ?
plex.tv information shows you have 2 servers running both on a machine with local IP Address 192.168.86.38
So it is probably one running as scheduled task or service - perhaps under SYSTEM user account and the other runs on the account you normally use and has Start Plex Media Server at Login enabled.
You can disable that in system tray Plex icon options or delete registry key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\Plex Media Server
We can find the user accounts the Plex Media Server.exe instances are running in by searching HKEY_USERS in the registry for ProcessedMachineIdentifier and see where the 2 entries are found. You would need then to convert the SID to the actual windows account name for each case for looking into the list in Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
If you are running under SYSTEM that is not recommended and best to run in same account you normally do installs with. I run PMS as a service in non admin account and install/update with admin account - but that gives me extra steps everytime i install/update PMS - i have to delete registry key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\Plex Media Server to avoid having multiple instances running
(I use PMS As a Service wrapper which you can consider
See PMS as a service )