See attachment. Opened road tools, then depot window. Did nothing else.
Toolbar are opened one below each other (configurable though). Dialoges open near mouse pointer. THis is designed to have short ways to move the mouse. That they overlap may be due to screen size and mouse position. One other screens it may give different results.
But it may be also an error, I will check.
I'll recheck this as well. Thank you for the explanation.
The depot window was indeed one of the windows that opened always at the same position.