Hello
Thank you so much for contacting us!
As for custom tab issue is concerned we do not provide support for 3rd party plugin you can contact with that plugin support forum.
Do you use Single Product Builder? If so, click on Tabs settings > scroll to the bottom for csto tabs – https://prnt.sc/105qwtw
You can add a custom tab here – https://prnt.sc/ztx8yy (edit a product), or in Theme Options > WooCommerce > Single product page > Tabs > Custom Tab.
Robert Hall
