Well if it is your theme, them the author of the theme can help you.
ok thanks, i'll try to contact the author, meantime can i try something else?
EDIT: i don't know if it's usefull but i upload this photo
If you have found the real cause (your theme), i'm not sure what you ask ? Fix your theme ?
Maybe switch to an other theme. I don't think anything more can be done with this problem. If you are a company (?) maybe hire someone to help you out ?
Well if it is your theme, them the author of the theme can help you.
ok thanks, i'll try to contact the author, meantime can i try something else?
EDIT: i don't know if it's usefull but i upload this photo
If you have found the real cause (your theme), i'm not sure what you ask ? Fix your theme ?
Maybe switch to an other theme. I don't think anything more can be done with this problem. If you are a company (?) maybe hire someone to help you out ?
exactly, i'm asking if it's possible to fix the theme or if it's possible to change the theme only for the forum's pages ( i don't think ). Yeah another solutions is to switch theme but for now the association doesn't agree with that.
Problem solved, i used a plugin to set different themes for my forum's pages. Thank you all for helping me!