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Density dependence of mass flow measurement.

Hi friends,

Though its very clear that mass flow measurement is independent of density i have encountered a problem it is as below.

We are using two kind of fluids for our applications out of which one is having a density of 0.85 and other fluid of 1.45.
When we are using same flow meter we are getting different performances with each fluid.
For example if i use fluid of 0.85 density am getting an accuracy of 0.02% but the same flow meter is giving an accuracy of 0.1% when am using fluid with density 1.45.
There is repeatability of this behavior.
What is the reason for this behavior. Do really flow meter performance is depends on density of fluids too for mass measurements.
Let me know the thing.