Vantage Theme Sub Menu problem

Hello all. I have a problem with Sub Menus. You can see the problem in http://ogulcanozugenc.com/ben-kimim/ address. When you hover the “Yazılar” page in the link, the Sub Menu has maximum 6 elements. But in other pages like the main page of the site, Sub Menu has 9 elements. Which is the normal thing. With pages with low data I have this problem. I tried to give Sub Menu a min-height but can’t do it. The problem is main, wrapper, html, etc. not going through the end of the page. I tried to give them height 100%, this solves the problem but with solving this it creates another problem. The blog “Yazılar” page did not scroll anymore and like static. Thanks in advance.
I think this is a bug with the theme.

Summary: You can see the problem at the link I have given above if you hover “Yazılar” and hover “Yazılar” in “Ana Sayfa” you will see the difference. Thanks.