Command F duplicate not aligned

Christos,

As I (mis)understand it, if it is within a pixel, I wonder whether it is a matter of Align to Pixel Grid / Pixel perfect art .

From CC 2017 on, you can see the options and behaviour here:

https://helpx.adobe.com/illustrator/using/pixel-perfect.html

For earlier versions, you may select everything and then untick Align to Pixel Grid in the Transform palette, and also untick Align New Objects to Pixel Grid in the flyout options. It is crucial that the box is completely unticked, not just a - which also counts as ticked.

It may be noted that even if Align to Pixel Grid is unticked with all objects selected, as long as Align New Objects to Pixel Grid is ticked the creation of new objects will result in those new objects being aligned, even when they are created from existing objects as may happen with Pathfinder operations.

You may avoid document types with that as default (RGB for web and the like) or change the default for such documents.

Here is an exquisite screenshot made by Ton in the first post for older versions:

https://forums.adobe.com/message/7841770#7841770

And here is an exquisite screenshot by Isa in post #3:

https://forums.adobe.com/thread/2119525

You may also see the screenshots by Tony in post #3 here:

https://forums.adobe.com/message/9397981#9397981