FTP transfer created new folder?

I did an FTP transfer yesterday using FileZilla. When I log into FTP today it shows that the transfer created a new folder? Files that should have been sent to mydomain.com are in a new folder that is mydomain.com_111111111. Any thoughts on how this happened?

This was my first attempt at transferring a website using FTP, so I’m sure I did something wrong. I just don’t know what.

Thanks for your help.