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Problem:
If you're experiencing errors with URLs, where links are getting mixed up between different languages, such as English and Turkish, and the issue is intermittent, the problem might be with your theme's handling of the slugs.

Solution:
The issue was not caused by WPML but by the theme's code in the

functions.php

file.

The theme was using a conditional function to set the slug based on the language, which was unnecessary and causing issues. We replaced the line:

$slug = (function_exists('icl_object_id') && ICL_LANGUAGE_CODE === 'en') ? 'products' : 'urunler';

with a simpler one:

$slug = 'urunler';

Afterward, we went to Settings > Permalinks and resaved the permalinks, which is a necessary step to see the results. This resolved the problem on the staging site.

Adhering to WordPress standards should avoid the need for specific compatibility adjustments with WPML.

Please note that this was a one-time exception, as custom themes are outside our support scope, and compatibility is the responsibility of the theme author.

If this solution does not apply to you because it might be outdated or not relevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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 issue persists, please open a new support ticket at our support forum.