AngularJS Nav Bars Stopped Working

I have a site that has worked fine for a number of months. But something recently changed that is causing my Nav Bars to not work.

The site is:

It works fine on one of my computers but it doesn't work on other's. I cannot figure out why the NavBars have stopped working.

If you go to the site and then scroll down until the top image disappears, the nav links then work. It's just when you scroll all the way to the top that it doesn't work.

 Any insight you can give will be helpful.

Paul KonstanskiProject SpecialistAsked:
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Paul KonstanskiProject SpecialistAuthor Commented:
I found out why they work on my computer... it has to do with the screen size. I have a massive screen and at my height they work. But at a shorter vertical screen length it doesn't work.

I am looking into that now.

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Paul KonstanskiProject SpecialistAuthor Commented:
Just took a minor change to add a z-index: -1 to the style sheet.
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