Little blob under navbar

[kall]

I have seen this in other places as well, it doesn't occur on all styles, but it's a little blob under the navbar, in the centre of the page.

It looks to me like some kind of vestigal welcome box..

Images attached from smooth blue and Grey styles in Firefox.

[Dean C]

It's to do with the category spacking modification. I thought in vB3 with the conditional that it was fixed. Either way it's just a little template mod :)