Reported for: WooCommerce Multilingual 3.6.2
Resolved in: WooCommerce Multilingual 3.6.4
When adding a single product (A) to the cart and right after adding a product bundle that contains that same product (A), is adding +1 to product (A) besides adding the product bundle itself. This by adding those products in the same language.
This is fixed in WooCommerce Multilingual 3.6.4-beta1