Problem: You are experiencing issues with WPML's Advanced Translation Editor (ATE) when used with Oxygen Builder 4.8.x, resulting in broken frontend rendering of translated pages. This includes loss of CSS and layout consistency, broken JavaScript functionality, and incorrect DOM structure. Solution: Currently, Oxygen Builder is not officially compatible with WPML. As noted on our compatibility page (https://wpml.org/plugin/oxygen/), some features may not function correctly in a multilingual site. We recommend proceeding with manual translation, similar to your successful approach using the 'Duplicate' option. We are in contact with the developers of Oxygen Builder to work towards official compatibility, but full support is not guaranteed at this time.
If this solution does not resolve your issue or seems outdated, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If further assistance is needed, we highly recommend opening a new support ticket at WPML support forum.
