Website Displays incorrectly on Mac w/ Safari

Or at least some macs using Safari, I don't have a mac so I don't have any real idea how to go about it, but if one of you has experienced this before or has a mac and wants to see the error for yourself the website is www.hoopdata.com

What happens if you cannot see it is after the black navigation bar ends you can see how the border seems to be a bit off, on some mac/safari systems the rest of the page aligns under that odd bar on the right causing the user to have to scroll all the way to right to see page content and all the way to left to use the navbar.

Any ideas are appreciated as I'm basically lost.

You can’t expect a website to work properly if the code is full of errors (http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.hoopdata.com%2F).

Now, luckily there is a simple fix to your problem: Add clear: both; to the div “twoColumnleft”.

But I still urge you to fix all HTML errors!

Or at least some macs using Safari, I don't have a mac so I don't have any real idea how to go about it, but if one of you has experienced this before or has a mac and wants to see the error for yourself the website is www.hoopdata.com

What happens if you cannot see it is after the black navigation bar ends you can see how the border seems to be a bit off, on some mac/safari systems the rest of the page aligns under that odd bar on the right causing the user to have to scroll all the way to right to see page content and all the way to left to use the navbar.

Any ideas are appreciated as I'm basically lost.
html markup is invalid, fix it first:

http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.hoopdata.com%2F

best regards