I think that we could avoid any distortion in uploading issues by merely creating a free Provari community shared Provarinati Photobucket account and directly linking from there.Are you using the upload function or pasting it directly into the test box? Even when the image is the exact size it's supposed to be, uploading seems to distort it.
I noticed that my own pics uploaded here got really grainy. I thought maybe it had something to do with the fact that I was limited to using Paint since MY computer was dead during that period, but since you just mentioned it....