I’m currently experiencing the same issue and it definitely seems to be the plugin. I just updated our site to WC 2.6 and prior to that we had no issues. It seems to only have happened since the latest WC update. We use WP Rocket for caching and it still happens even with caching. Gotta imagine WC changed how tabs get hooked in or something that is causing some issues with the tabs plugin. Any fix for this planned?