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The node configuration you have labeled as "Stream 2 Source Node", "Temperature Setpoint Node", and "Pump Outlet Node" are the OpenStudio defaults. If you leave those input fields blank in the TemperingValve object, as you might have, your idf file will automatically be created with settings like you have illustrated.
You could try overriding the OpenStudio defaults since they were not anticipating a component between the plant mixer and the outlet node. I'm not confident it is the source of your error, but consider adding a setpoint manager to the node immediately after the mixer and then setting the tempering valve's Temperature Setpoint Node field to the node immediately after the mixer. You do this by clicking on the tempering valve icon and then selecting the node name from the drop down menu.
By the way the logic for the OpenStudio default setting is located here in the source code if you would like to inspect it. If you have left empty settings then this logic will fire when OpenStudio creates the idf file.