It sounds like you have a form that is using grid layout. Change it to flow layout and the grids will be spaced apart be whatever is between them in the HTML.
<rant>
Whoever it was at Microsoft who felt that visual studio should default web forms to use grid layout, or for that matter that ASP.net should even SUPPORT grid layout, obviously never built a dynamic web application.
</rant>
Peter
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Work smarter, not harder