Windows Explorer window(s) open after batch sync completion

[chota300]

I use a batch job to essentially sync two drives, triggered daily by a Windows 10 64-bit Task Scheduler task.
Sometimes, but not always, a Windows Explorer window for one or both sides of the sync remains open after the sync completes normally.
This does not seem to harm the sync function, but it is annoying.
What can be done to ensure the Windows Explorer windows are closed after normal completion?
Thank you.

[Plerry]

FFS does not spontaneously open (one or more) Windows Explorer windows (unless you explicitly tell it to do so).

[xCSxXenon]

Yeah, nothing is FFS is able to automatically open up an explorer window. There could be a post-sync command but you stated that they "remain open after the sync completes"

[chota300]

I checked the job.
I have no post-sync commands.
And I find no where to open an Explorer window.
I'll chalk it up to another Windows 10 bug and manually close the windows after each job execution.
Thank you all for the help.

[xCSxXenon]

Also check the task in Task scheduler in case there are some unwanted things in that configuration