Limit links in menu?

Hi,

When i add link in top menu and save then in site is broken i get only name link and href disappear.

If i delete this link and add new its same problem but when i add more links and save then all new links get delete.

site: https://www.tristram.xgame.pl

link “Reklama” dont work its only name ;/

<li id="menu-item-2003" class="menu-item menu-item-type- menu-item-object- menu-item-2003"><a>Reklama</a></li>

Ps. sry for bad EN.