It just can't find the style , the css I mean. I can see it's stored in database. Try this go to admincp --> maintenance and rebuild the styles
example.com it's on your general settings -->Site Name / URL / Contact Details
change it to toyr domain name and forum location
https://www.vbulletin.com/docs/html/...up_sitedetails
actually do the site url first then if it's not working try the rebuild