This thread is resolved. Here is a description of the problem and solution.
Problem:
You updated the Spanish URL links on the pricing tables, and they work, but you noticed an issue where a link with an incorrect package ID still functions. Additionally, you encountered a problem with mismatched titles on the add listing pages, where the word "Anadir" appears instead of "Agregar".
Solution:
For the issue with the functioning incorrect package ID, it's possible that the system defaults to a valid package if an incorrect ID is somehow still functional. We recommend checking the configuration settings or the database for anomalies related to these IDs.
Regarding the mismatched titles on the add listing pages, we resolved this by translating the 'Add %%pt_single%%' string. You can verify this by visiting the WPML String Translation page at WPML String Translation.
If this solution does not resolve your issue or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket.
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This topic is split from https://wpml.org/forums/topic/changing-the-url-slug-is-not-working-for-the-add-listing-page/