There isn’t enough information here to know exactly what happened but here are a couple guesses based on what you shared:

• When uploading through Filezilla were there any failures recorded in the Failed transfers tab?

• When uploading did you use a normal user account or did you upload as root? You may need to adjust the permissions on your uploaded files with “chown -Rf www-data:www-data /var/www” as long as your web root is under /var/www.

“Distrorted, broken or jumbled” sounds like an issue with your CSS not being loaded by the browser or not all of your CSS being loaded.