The image that you posted of the listed imaged size from Image Management shows 2 sizes. The first being the size of the computers HDD that you are taking the image from. The second is the size of the image in the location listed in the Image Management T440-Master Record that you put up. The problem may be an FTP Issue, here are some steps to troubleshoot that. If after taking an image, there is a folder in the /images/dev/ directory with an image file, it may be a security issue on the server for the fog user.
I have run into an issue where the user account that I used for fog was denied access to login to the server and that prevented it from moving the image once the ftp was complete. I have entries in the file: /security/access.conf:
+ : root,fog : ALL
- : ALL : ALL
Without that entry, the fog user is unable to move the image file to the appropriate spot after imaging.