I just installed new monox nightly build and still I am facing the bug in IE 8.
This is my version: MonoX v126.96.36.19984 [12/27/2012], DB v4.7.3842
For reference, please see the same screenshot that I attached in above post.
Its strange that in demo site, I don;t see the bug right now when I try to view it from IE 8, this bug only comes when I install monox on my machine.
(FYI....if you are going to ask me the css, you can just download the latest nightly build , same version which I mentioned in this post, I have not made any modifications in css, haven't touched it at all)