Longevity – Menu options disappearing?!

HELP!

I’ve been working on redesigning our website with the Longevity theme and now it won’t let me add more buttons on the top menu. I used to have all locations listed up top and now I try and add Corvallis and it won’t save the tab in the menu section. This is urgent and I need help ASAP. We have ONE website that we use for MULTIPLE locations. If I can’t have as many pages as I want… this is going to pose a large problem for us with a lot of time wasted :/ I’m in panic mode! ??