Hi Levi Pedro Marcelino Matlombe,
Thank you for reaching out to Sophos Community.
Can you please share the current running firmware version on the firewall?
Hello Levi,
Did you try using a different browser such as Chrome or Firefox? It seems like a browser-related issue.
In any case, you could also try upgrading to 17.5.15 or 18 MR4 if the issue persists.
Regards,