Hi Chen,
I'm working on a new Autumn theme and have been building it here (https://79.143.183.101/SMF214/index.php?action=forum), I'm posting this link so you can see the theme working as designed. If you go to here (http://www.davejohnson.co.uk) you see the theme installed there also.
On the build site with Tiny Portal installed (that's what I'm using on Quizland) everything looks fine with the title and cat bars, but on DJ.co.uk with EhPortal installed the title and cat bars in the portal have a gap at the bottom where the leaves are sitting.
I have highlighted the issue in the attached, dj.png has the issues and smf214.png has not.
Any ideas why that's doing that?