Hello, Teralt2003,
Thank you for your response.
In this instance, there are three options to choose from:
1/ You can create a staging site (full copy of the live one), where the problem is visible, and provide us with temporary wp-admin and FTP access.
2/ Activate our theme on your current site and let us know, so we can start works there.
3/ Do not use that cache plugin with our theme on the mentioned site.
If you have any other questions or concerns, please do not hesitate to reach out to us. Our support team is always available to assist you.
Kind Regards,
8theme team