"new post" makes my links broken

[manuelsechi]

Hello All

from the forum home, if I am not logged in, my links to the last message in a forum are something like this:
/action-game/1603894-questo-ng-deve-cambiare-nome.html

if I am logged, the link changes:
/action-game/1603894-questo-ng-deve-cambiare-nome-new-post.html

for some of my forums, the "-new-post" makes my links not to work. Is there any way to fix or disable this postfix?

thank you
regards