While using Adobe Illustrator CC 2017.1 release on a Macbook, I get these strange lines as outlines/connecting around my shapes and they appear even in my png and pdf exports. See image below.
In the image, the white rectangle cutout in the brown part had no stroke and I think I used Shape builder to remove the extra part. As for the black circular shape, I think I used a pen with white fill, no stroke and drew inside the circular shape. And I've seen this error in both RGB and CMYK file mode. And i've even tried unchecking Anti Alias settings in Preferences to no avail.
Is this a bug or some setting mistake ? Very problematic as I need to use Illustrator for work. Please help!
And this is the outline mode below.