Change subtitle positioning in Aegisub

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Hello.
I have a problem.
I have an ass subtitle, and trying to change the positioning of 3 lines.
Those lines are in style "title", so I'm trying to edit that particular style with this:


However, even if i change the margins and save, the subtitles don't change at all!!!!
Also, the changes aren't visible in the preview too.
Although if i change something else (eg. font etc.) it is visible and affects the subtitles when saved.

By the way, even if I manually change MarginV with notepad in that style (and save), the is no effect whatsoever!!
While you can see that the value is changed, there is no effect!
I'm getting crazy here..
Any help??