It's simple. On this site is (apparently homemade) counter. It records your statistics, including with a browser in here. Well, after you determine the browser (guess curve) crashes with an error. The second time, thanks to cookies, the mechanism of parsing the "what browser" is not enabled and the site opens.
Roughly, the error is in the file /includes/hits.php in rows after the 17th
\rWarning: Division by zero in /home/h13u1/public_html/includes/hits.php on line 16
If this is your website, then check the initialization of variables is likely variable associated with the option of entering through IE is not initialized, then there is a division on it, that is division by zero which creates an error already.