Hi there @vasilis4sar ??
Thank you for reaching back, with further details on this.
I went ahead with testing this, with a test installation of mine, running WooCommerce version 8.4.0. Everything worked as expected, for a variable product, as is showcased in the screenshots linked here (with no variation selected), here (with variation one selected), and here (with variation three selected).
To clarify, did you already have a chance to test with only the WooCommerce plugin active, and the Storefront theme (linked here) activated, and see how it goes, or otherwise?
Furthermore, I’d recommend reaching out to the Extra Product Options & Add-Ons for WooCommerce: απ? τον/την ThemeComplete – 6.4.2
plugin’s support channel, as it is the one that stands-out when investigating the site’s System Status Report (SSR), and they would be in a better position to assist you further.
I hope this is helpful! Please let us know if you have any further questions or concerns.
We will be happy to help you further.
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This reply was modified 1 year, 1 month ago by
anastas10s. Reason: typo
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This reply was modified 1 year, 1 month ago by
anastas10s. Reason: rephrase