showing an extra art-board which doesn't really exist
It is showing an extra art-board which doesn't really exist,
Illustrator 2017 ME
Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator