Resolved
Reported for: WPML Multilingual & Multicurrency for WooCommerce 4.12.6
Resolved in: WCML 5.3.0
Overview of the issue
Currently, translating your tabs created with WooCommerce Tab Manager plugin is recommended only with WPML's Classic Translation Editor. If you use the Advanced Translation Editor, the tab will be duplicated every time you save the translation.
Workaround
This feature is still not fully compatible with WPML's Advanced Translation Editor. As a workaround, please use the Classic Translation Editor instead.