Alignment question

[Etdronehome]

I am designing a business card with one logo and several typical lines of text. All items are one line and will be vertically centered.  I wanted to align all to the center and selected all of them and selected alignment / center. The alignment did not look right. but it did complete the command. I had the grid on for visualization.

I thought I would try and center each separately. I selected just the logo and did the same command and it repositioned the logo and it now looks correct. Then I selected all the remaining text lines and did the align command and they lined up in line vertically with the logo. 

Question is why did this happen. 

 

Rich

[Alfred]

When you selected all and centre-aligned, you aligned the objects to each other. When you selected just the logo, you centre-aligned it with respect to the card, and then selecting everything else and aligning it made it line up with the already centre-aligned logo.