Access bar backgroung JUMPS to the top

I am using the thematic theme for my website … I have designed the header, and it looks good on the home page as in this figure
https://imageshack.us/photo/my-images/714/homekw.png/

… BUT on all pages other than the home, the background of the #access bar jumps to the top like that , and covers the title ??
https://imageshack.us/photo/my-images/14/otherq.png/

although I am using the style sheet which is seen by all pages equally …

Why is that happening???