[Fechado] WPML WPALLIMPORT ADDON

Background of the issue:
I have an eshop with around 30k products translated in Greek (main) and English. All products are updated and imported using WP All Import and our suppliers' .xml files. I am trying to match the translation of Greek products with English using the WPML addon. Here are some links to illustrate the issue: link oculto, link oculto, link oculto, link oculto, link oculto.

Symptoms:
Some products do not match correctly between Greek and English. The products have the correct title, SKU, and category, but clicking on them results in an infinite redirect and failure.

Questions:
Why are some products not matching correctly between Greek and English?
What causes the infinite redirect when clicking on certain products?