Hi @Paolo,
Apologies for the delay, however as per our support policy, each reply you add takes you back in the queue.
The products being different sizes appears to be that WPML is altering the outputted image size, if it doesn’t use what is already set in WooCommerce > Settings > Products. This is likely an issue their end.
With WPML issues, we advise users to take it up with WPML first – as it is a plugin at the end of the day, not something we develop. If the issues are with our theme, then they will contact us and we will resolve it immediately.
Thanks,
– Ed