When the plug in ‘WooCommerce Multilingual & Multicurrency is activated, and a front end user creates a booking using the WooCommerce Booking plugin, the order gets duplicated by your plugin.
When I deactivate the plugin, and test again, the duplication does not happen.
Please see this Loom video for full documentation:
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I have developed a custom sync between WC Bookings and Google Cal, but this sync is not causing the issue.
Thank you for contacting us. I am happy to help you.
What you are describing is the normal behavior we are having. As you show us, the order is 1, but we are duplicating the booings between languages in order to maintain the availability sync between languages.
Now about the google calendar project I cannot help you further, but I can share some of our docs that might help you.