This thread is resolved. Here is a description of the problem and solution.
Problem: If there are over 1000 WooCommerce products, tags, categories... Then the WooCommerce multilingual is showing that some items have not been translated. Solution: Set this in wp-config.php:
define( 'WPML_TAXONOMY_TRANSLATION_MAX_TERMS_RESULTS_SET' , 3000);
Just before the "/* That's all, stop editing! Happy publishing. */" line
This is the technical support forum for WPML - the multilingual WordPress plugin.