Non Subscribers sync problem

We recently built a brand-new website for greekroots.shop from scratch and replaced the old one. We imported all the old orders using the Order Export & Order Import for WooCommerce plugin.
The old website was integrated with the Mailchimp for WooCommerce and MC4WP: Mailchimp for WordPress plugins. We set up these two plugins on the new site with the same settings as before. After completing the configuration, we connected and synced them with Mailchimp.
However, after the synchronization, the number of contacts increased from around 3,000 to about 10,000, which caused an issue because most of these contacts were not subscribed. The problem seems to have occurred during the synchronization process of the Mailchimp for WooCommerce plugin.
As a result, in the client’s Mailchimp account (where the contacts increased), emails and automations were sent to all these contacts.
Additionally, in the same Mailchimp account, the client has another audience linked to a different website (through the same plugin). We did not make any changes to that website, yet the number of contacts in that audience also increased.
Moreover, in both audiences, many of the new contacts are people who made purchases on the website but never subscribed, and yet most of them were incorrectly marked as subscribed.
We have already contacted the platform support and we were instructed to open a Topic here.

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