Objects in Illustrator doesn't align perfectly
When working on logo design projects, there are some things in Illustrator that doesn't work perfectly. For example, when I need to make rectangle and then put in rounded rectangle and then aling to centre, it doesn't do that perfect. Why? There are lots of more examples to tell you but I think you get the point what I'm talking about.
For anyone else searching, I believe the problem is a little option when you first create a new document. It drove me crazy for the longest time. It causes objects not to line up correctly. Unclick align to pixel grid, and you should be good to go.
Pixel grids are useful for designing icons for the web, and web design in general, but when creating logos it can cause problems. A pixel grid is different from a regular grid.