What happens if you use Extended desktop instead of Clone?
Keep in mind that in Clone desktop, the video resolution is limited to the maximum resolution supported by the smallest display, so in this case, this would be limited to 1366x768 approximately. Hence when you try to set this to a 1080 display, the image needs to be scaled, so you need to set back those settings.
What you could do would be to create a scheme profile with those settings which you can later use and select through right clicking on the system desktop. For information on that feature please check this article: