Dear @Farhad,
We hope this message finds you well.
Could you kindly provide us with the URL of a single product page where you are experiencing the reported issue? At the moment, we are unable to identify any problems in the console, apart from a JavaScript error originating from a third-party plugin (please refer to the attached screenshot in the private area).
We would appreciate it if you could replicate the issue on your end so that we can thoroughly investigate and implement an appropriate solution on your website.
Thank you for your cooperation.
Best regards,
The 8Theme Team