https problem: first connection Failed, next connections Ok

Hello,
I've got problem with https :

At the first HTTPS connection the page is blank, but after a refresh 
(like pressing F5 on Firefox or IE) the page is well served.
Here is a link to see the problem :
    https://ns300019.ovh.net/
    https://ns300019.ovh.net/tools/env.php

The problem is appening on some of my servers but not with all of them. 
I'd compared softwares version but they are sames :

   Apache/1.3.39
   mod_ssl-2.8.30-1.3.39
   OpenSSL/0.9.6m
   Php5.1.6
   Linux 2.6.21.5

Have you got any idea ?
thanks
cyrille.

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