I saw something strange on Wordpress. I explain;
I created a menu, added some pages to it. I added a css class to one of the page item, I saved, no problem. Then I added the same css class name to another page item. I saved, then this page item just disappeared. I tried many times and Wordpress seems to disallow a same css class name to more than one object, like it has to be unique.
Is there a reason why it's like that ?