Hello, Alex,
Thank you for wp-admin access.
We’ve checked the Mega menu on your site via Chrome and Safari and do not see the problem still.
Please try to check it from another device and different browsers.
“Also when i try to enter the main page by the admin page it doesn’t load. It appears like this.” – could you provide a video or screenshots of where exactly do you click to see this issue?
Please upload these media on the filesharing service and provide us with URL – https://wetransfer.com/
Kind Regards,
8theme team