[Plugin: WP UI – Tabs, Accordions, Tabs, Sliders] Multi-site Environment

I am running multiple WP sites and installed and activated the WP UI – Tabs, Accordions, Sliders plugin. It works as expect on my main site https://nesbittrealty.com

But it does not work on other sites on the same machine. I suspect this plugin might have knocked out instances of DS IDXpress running on the other sites as well. However, I deactivated WP UI and saw no change in the non-working instances of IDXpress.

Any clues where should I start to figure out why this works fine on one site but not another?