This thread is resolved. Here is a description of the problem and solution.
The permalink slugs of translated pages don't have the same structure of original pages.
The reason for the issue is the fact the parent > child page structure, while in the default language all the parent pages are translated the same doesn't happen for the translated pages, in this case the solution is simply to translate all the parent and child pages in all the languages.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
Our next available supporter will start replying to tickets in about 5.67 hours from now. Thank you for your understanding.