Full Nav Page Problem

Can anyone works this out. For some reason the close symbol won’t show on the drop down navigation menu when it is set as a full page…

I have a site I built for some one else and it works on that but on mine for some reason it wont show the X which closes the main nav page…

It is obviously a bug…? Or…?

Please help guys, it is driving me mad…

I actually don’t even have a close option for a side bar menu…

Anyone know how to debug this…

Can anyone help? I have tried everything and it is possible I will have to do the whole site again. I have tried installing new nav bars, and every time they still do not show a close symbol as in the X - this can be side menu, or full frame menu…

I can’t work out why this has happened but I can’t find anyway of resolving it.

Figured it out…I had to do a lot of deleting of codes etc that must have caused me some problems…