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Negative Pressures - WaterCAD

I just upgraded my model to the latest version of WaterCAD. I'm running a steady state model and I'm getting negative pressures on the suction side of some of my pumps whether or not the pumps are on. I also have some FCV that are closed that have negative pressure. This doesn't make sense to me. What are some possible things I can be checking to fix this (assuming that it shouldn't be this way)?