Your whole setup is not correct and the information you sent is least helpful for detecting the problem. Carefully check the swatcup input files and see the Echo files to get some clue where the problem may be.
Karim
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There could be many reasons! The graph you sent tells me the swat model you built is not yet ready for calibration. I recommend you read the paper
http://www.sciencedirect.com/science/article/pii/S1364815215300499
to get some ideas about pre calibration analysis that you can do to improve your base model.