I have been having this problem in the last couple of uploads lately. After editing I will open up the edited photo and just check that it is all ok and looks fine. I will then put the photo on flickr and ask for advice in the photography feedback forum. when this is done I will upload the photo. here is where the problem start. when I upload the photo, somehow the photo just decreases in contrast for some reason. Has this happened to anyone? here is an example.
Here is a photo that I posted in the photography feedback (which has plenty of contrast)
Here is the photo after I uploaded it (which lacks in contrast)
This is only one example. There are some worse photos than this.
Does anyone know how to fix this?