Broken links

Hi, i don't know why but several of my forum links (javascript, attachments...) appear like this way and i have no clue why it happens. I tried to check some other IPS sites (4.0.x versions), included the original IPS forum, and they were fine, so i instantly thought that was some misconfiguration somewhere in the config.php file or in the admin cp, didn't fin NOTHING. Everything seemed to be perfect, pls help me... i'm getting crazy