Thanks for the report.

At the end of the page you will find an anchor link and you will see what happens.

Would you please explain here what happens and the wrong URL that was created?

Ok, i'll try to explain it better:
at the end of this page (click on the word "page" to reach it) you will find another link, this:
http://www.istruzione.it/pon/avviso_licei_musicali_sportivi.html#sec_gra
If you now click this link (you need to click it from that "mother" page otherwise you cannot see the problem), you will see that it trasforms itself (thank to the Cross Domain Linking of Piwik enabled) in this:
http://www.istruzione.it/pon/avviso_licei_musicali_sportivi.html?pk_vid=83212036884138d11500899477262601#sec_gra?&
putting the anchor inside of the piwik string instead of let it outside.
In this way the anchor i need doesn't work, but if i rewrite the link in the right manner (putting the anchor outside of the piwik string):
http://www.istruzione.it/pon/avviso_licei_musicali_sportivi.html?pk_vid=83212036884138d11500899477262601?&#sec_gra
it works perfectly.
Forgive my english, i hope i've been clear this time.
Thank you

Thanks for the detailed report, we'll investigate this