Hello,
Thank you for reaching out, and we apologize for the inconvenience.
I have checked your website in the Firefox browser, but I was unable to reproduce the issue. On my end, only a single logo is displayed.
Could you please clear both your Joomla cache and your browser cache, then check again to see if the issue persists? If the problem still occurs, kindly let us know and, if possible, share your Firefox version along with a screenshot or screen recording so we can investigate further.
Thank you for your cooperation.