MyBB Community Forums

Hello

I'm working on a new website and trying to configure MyBB for the first time.
I already solved a few issues but I've just noticed a new problem really weird for me :

My profile links are not working :
my forum is on maintenance right now but the url is : http://www.jc-oates.fr/forum

The links are the following, without the /forum/ :
Edit profile ==> http://www.jc-oates.fr/usercp.php?action=profile
Change avatar ==> http://www.jc-oates.fr/usercp.php?action=avatar

Same issue for Connected friends, View new content, View today posts...
They lead to an error page on my WP blog (which is installed at the root of my domain)

The only working link is Subscribed threads ==> http://www.jc-oates.fr/forum/usercp.php?...scriptions

I have no idea what's going on there, have you ever seen anything like that ? 

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I actually edited the template with the links, adding /forum/ in the URL...