NDR nitrogen total export values are negative

Hi! I am doing research on analysing land use change impact on ecosystem services. One of the ecosystem services models that I am using for the analysis is the NDR model. However, after running the NDR model for many times, my nitrogen surface export values were negative. I even changed my watershed shapefile into subbasin and subwatersheds, but the values were still negative. What could these values imply? Is Nitrogen being retained?

I hope you could guide and enlighten me with regards to this.

Thank you!

Attach the logfile here:

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Thank you!
I will look into it

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