upfront / mobile content half screen

Hello there,

I'm getting a mobile view problem - half screen content.
https://bahtstart.com/go/bahtstart-project/

Using a desktop, the page is displayed correctly. However, using a mobile, the page is cut in half.

I'm getting this problem using a tabs plugin. I thought it was a problem with the actual plugin but i did installed a totally different 3rd tab plugin and I'm getting same problem.

What would cause the screen to be cut in half like that? jquery problem?

I'm using upfront/text element and use a shortcode to the tab plugin.

I have enabled wpmu dashboard support if you want to see.

thank in advance