Not showing full article after clicking ‘Read More’

Hello,

Recently I have just installed WordPress. I have download (and using) simpleX theme, WordPress V2.7, WP-Super Cache (disabled), sabre, and Extended Categories (disabled). I have modified the theme as well.

The problem is, today, when I try to click ‘Read More’ (I have changed to Continue Reading), it will show the post / article that I have posted but the problem is, the ‘earlier’ part of it is ‘hidden’ under the header.

Here’s an image of what I’m talking about :
Link to the image

So, I hope that anyone here can help me to look out what’s wrong with it? The current URL for it is https://www.dinoflash.com/blog

Thanks for your help and have a nice day.

Edit : It is happening in both Internet Explorer 7 and FireFox 3