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Imagine an object with a "Cell size" of 0.1 with an activated "Slice plane" option. To shrink the SDF and fit it to the object's borders exactly you enter a negative value, e.g.- 0.085. Now you start the simulation, but the particles still have a slight offset, and it seems as if your settings did not have the desired effect. The reason is that object is subdivided into cells of 0.1 metres and this is a fixed valueyour step size for the "@ Offset [Axes]" parameters. In other words, the only working values are integer multiples of the current "Cell size": 0.2, 0.1, -0.1, or -0.2 etc. So, if you want to adjust the SDF, take a look at the current "Cell size" and work with this value to adjust the SDF. Values, different from the step/cell size, are rounded by RealFlow.