This thread is resolved. Here is a description of the problem and solution.
Problem: It seems the "Meta Options" panels, of the translated version of the post, do not contain the same fields of the main language.
Solution: I would like to ask you to visit this link and follow the steps described to translate custom fields using WPML: https://wpml.org/documentation/getting-started-guide/translating-custom-fields/
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.