You have a problem with a template, or something to do with the all in one seo pack plugin.
On your index page your head section renders out the following all in one seo pack meta information
<!-- all in one seo pack 1.4.5.8 [-1,-1] -->
<meta name="description" content="Personal website of Erman the Photographer. Erman shares his works about different kinds of Photography; such as portrait, nature, landscape, model, urban and also Design at ermany.net. In addition you may find useful information and tips about photography and cameras here." />
whereas on your photography page it renders out:
<!-- all in one seo pack 1.4.5.8 [-1,-1] -->
Photography<meta name="description" content="Photography section of ermany.net." />
As you can see for some reason the word "Photography" is appearing outside of the meta tag - as a result the page is rendering this word at the very top left corner of the page (you'll see the text if you look very closely).
This is pushing everything down a bit.
I'm not sure of the exact solution, but there's a problem either with your template files, or something in the all in one seo pack plugin.