I need a help in my css.., i am using an Isotope for my portfolio, I want my grid to be responsive but I have a problem with the grid look in 960px below size browser.

here's the screenshot:

it looks like after the first row, the divs are floating to each other. I wanna fix this so bad, is there anything wrong with my CSS? if you wanna see in actual, you can visit the website , you need to login to access so you need this.

username: user

pass: IU0M1,'Q

I couldn't login. Tells me the password for 'user' is incorrect.

thanks for the response, you can login now.

I donot see any problems in the latest chrome.In which browser do you experience problems?
Do you use a css framework?
Any reset.css?
If you can answer to this questions than I maybe able to provide more help.