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Hello agricolaparra,
Thank you for using our plugin. I am sorry to read about your issue.
Based on experience usually such changes are being triggered by an automated process. Check if you have a plugin, or some rules / logic in WooCommerce that is changing these automatically.
Offhand it is very difficult to say what is triggering such a change without knowing the details of the setup, but the most common way of troubleshooting such issues is to deactivate other plugins and see if the change perists.
I am sorry we cannot help you any further on this issue, but this is not a plugin issue. All the best with finding the solution.