Images converts to text files via FTP/Web ControlPanel transfer

Hi TechV,
How do you explain what happens whenever I upload a JPG file to my website control panel, it converts into a .txt or TEXT file? Due to this, the file becomes useless and thus can’t be viewed as an image. I’ve searched for several remedies including making sure that my binary transfer options/converter settings are in place–that is not the issue; my server is doing okay as well. I just want to know the detailed technical reasons why the file converts by itself.
