Adding code tags does not appear to render correctly, could be an isssue with bb tag replacment perhaps
.subforum-column {
margin-bottom: 0px;
}
.subforum-info.subforum-column {
margin-top:0px;
margin-bottom: 3px;
}
Should be multiline
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ok, that's odd. Format is ok here. Must be something else in the post causing it!
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You can change it easily, to remove the gaps (like below) you just need to add some css
I just added this css override 
.subforum-column {
margin-bottom: 0px;
}
.subforum-info.subforum-column {
margin-top:0px;
margin-bottom: 3px;
}
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OK, something in the post is causing the issue
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looks like it was just a glitch, seems to be ok now