[Plugin: WP UI – Tabs, Accordions, Sliders] skipping first tab

For some reason the first tab is getting skipped. It initially shows the first tab but then quickly switches to the second one when the page has finished loading.

Anybody know why this is?

Thanks

https://www.asgdatasolutions.co.uk/dev/ndr/0001/products/nd4020-desktop-printer/

https://www.ads-software.com/extend/plugins/wp-ui/