problem redirection links a suport to another on the same server

[Zoul]

Hello everyone
I have a problem forwarding between Vbulletin and 4 pictures

to explain simply
if I filed to link :
http://www.gfx-art.fr/gfx/details.php?image_id=19227

to a topic:
http://www.gfx-art.fr/forum/showthre...t=3528&page=10

when something be the person to click on link for the first time
here is the url redirection
http://www.gfx-art.fr/gfx/showthread.php?t=3528&page=10

you will notice that it is a mixture of the two addresses

to in the second try, it goes well for redirection.

we have already discussed the problem and we improve many thanks to a 404. htaccess
Here are its contents:

DirectoryIndex index.php


RewriteEngine on
RewriteRule ^gfx\/private\.php(.*)$ "http\:\/\/www\.gfx-art\.fr\/gfx\/" [R=301,L]
RewriteRule ^gfx\/showthread\.php(.*)$ "http\:\/\/www\.gfx-art\.fr\/gfx\/" [R=301,L]
#RewriteRule ^gfx\/search\.php(.*)$ "http\:\/\/www\.gfx-art\.fr\/gfx\/" [R=301,L]

would you have an idea to fix problem is?
for information I do not have the problem between Dotclear and Vbulletin

thank you very much