DianaE:

I have a simple feed-forward net with one input and one output, it runs but when I graph the target versus the network output, the two curves matches but they are on different scale
here is the graph



The two curves here are almost fully correlated with each other but they have different scales. So, my guess is the loss function you have used is somehow related to correlation. But correlation does not take care of the scale, so it explains why the scales of input and output are different.