In layout designer, the grid occupies only a small area. We can not depend on the grid to align the Ctrls. This may be a bug.
I have to say I am really confused about the screenshot and the message...
- grid is not activated there (the button is switched off)
- what is that "visual" grid ? Is that something you have added to illustrate the problem?
Other than that, from quick testing, it seems to work just fine... If it does not work for you, we will need to establish the how to reproduce the problem.