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The flow arrows on pipes or conduits in a model are pointing in the wrong direction.
First, make sure that the start and stop nodes are correct and make sure the flow values are correct. Note that if you have flow that goes from the stop node to the start node and you have negative flow, the flow arrow is correctly orientated, and is indicating negative flow in the pipe or conduit.
However, if the flow is positive and the flow arrow is indicating from flow moving from the stop node to the start node, try the following steps. Close the model, but leave the program open. Next, go to Tools > Database Utilities > Compact Database. Select the model's database file and choose the open the purge the database to save space.
When this process is completed, open the model and compute it. The flow arrows should be correctly displayed.