This thread is resolved. Here is a description of the problem and solution.
Problem: How can I get the attributes to show in the correct language when editing a product?
Solution: In this case the attributes were added in Greek, but assigned to the Greek language. To resolve this, go to WPML -> String Translation and change the language of the strings to Greek. Then you can add the English translations.
Alternately, you could edit the original attributes and add the Greek translations via WooCommerce -> WooCommerce Multilingual -> Attributes.
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