Why does the TDBGrid take up more space at run-time?

Why does the TDBGrid take up more space at run-time?

I have bumped into a pretty confusing problem.
At design time, I clearly indicate the size of columns (width and Max
width) for the TDBGrid.
Here's the problem... As you see, the design time and run-time grids are
different in size. And also note that the form is the same size.
Please ignore the rest of the screen. My only concern is the window with
the grid :)
Is there any way I can fix this?
BTW, I'm working on Ubuntu with Lazarus but the software may be on Ubuntu
or Windows.
I'd really appreciate nay inputs on this. Thanks!