Clicking on the tab a second time makes the content disappear

I’m using the tabs plugin on the “What I Do” section of this site: http://mg-testsite.com/danacobar/

I’ve changed the styling a bit, but that’s basically it.

If as user clicks on the tab, and then clicks on the active tab again, the content from that tab is no longer visible. What can be done to fix this?

https://wordpress.org/plugins/tabs-shortcode/