strange behavior of the content areas

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hi

i have a problem with my theme. its strange because this is my 5 theme i make on a same way and first time i noticed this problem.
The content areas selecting bars , when u pas over them to ad some content, the gray overlay that appears is not over the dashed rectangle , where it should appear but under it about 10-15px???
First time i seen this.
Its annoying because u can not properly select the content that u would edit.
the theme is build over a html page, structure created with tables not divs

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rutrem