Fluent shouldn't do that. Please can you post the report monitors so I can see how they behave on restart, residual too. Have you got any expressions/profiles/UDFs hooked up that need/calculate data in the background? With poor meshes I have seen jumps in values for very stiff problems as the gradients aren't retained in the data file: the restart recalculated the gradients with very slightly different values which then altered the solution. Both results were numerically correct and revising the mesh to better capture the gradients fixed this.
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