Menu-Alias Problem (again)

once more menu-alias problem.
If i go to the menu-configuration an I set up an new Menu-Item, everything is ok.

But then, when i go second to the menu configuration, the system automatically changes the alias of the menu-item.

here you can see the difference:
original link (after first save) http://90minuten.at/90minuten2013/index.php/sportsbiz
second save (when i do changes in the menu item): http://90minuten.at/90minuten2013/index ... /sportsbiz

so suddenly the alias /k2-extra-fields alias is in the url and I have no chance to delete this alias

please give me a hint - thx

Are you sure that parent item don't have this 'k2' alias ? Please try to disable and enable again SEF URL's system.