FTP uploaded images appearing as 1×1 pixels

Trying to upload images using Filezilla into my theme’s image folder. The image uploads but when I go directly to the link it only appears as a 1×1 pixel image, but when I download it back from Filezilla it is the correct size. I cannot for the life of me figure out what I’m doing wrong! I’m sure it’s something silly but it’s driving me crazy!

This is the site: http://thirroulbeachmotel.com/

And this is the link to the logo that *should* be appearing:
http://thirroulbeachmotel.com/wp-content/themes/executive/images/logo_grey.png