Forum notifications pointing to 404 pages

Hello,

When users post something on the forum, the notification email is pointing to a non-existing page.

For example, one notification sent to the users is pointing to:
http://cursos.portal-gestao.com/perguntar/teste-2

But to admins, the links is:
http://cursos.portal-gestao.com/component/easydiscuss/teste-2?Itemid=189

And this one works.

How can we fix this?

Thanks you,