Hi @vpedrozo,
Some good news just arrived from our conversation with WPML Compatibility team.
CartBounty has no issues with compatibility, however you must make sure to enable language cookie that supports AJAX filtering.
By default, WPML does not set the language cookie for site visitors that are not logged in. However, some themes and plugins need to run AJAX calls on the front-end, based on language information.
To enable language information for the front-end AJAX calls, go to the WPML -> Languages page and scroll down to the Language filtering for AJAX operations section. There, check the Store a language cookie to support language filtering for AJAX option.
Here is additional information: https://wpml.org/documentation/getting-started-guide/language-setup/enabling-language-cookie-to-support-ajax-filtering/