Right? I cannot understand why the heck it's doing this!

This is the Class List file opened from the above website.
http://postimg.org/image/55midcr13/

Just wanted to note - this is not the Weebly website causing the problem as other website hosts are doing the same thing for me. Also not this website in particular - it's my own website too, and I haven't changed the way I upload documents or anything.

EDIT: Sorry, can't figure out how to get it to show up as an image rather than a link. If a mod could fix this I would appreciate