When baking shadows for objects of almost the same size DELTAGEN will apply the shadow texture resolution “Min. size” to “Max. size” range in direct relation to the objects´ geometry size range regardless of their overall dimension.
In our example you can see that this causes the slightly smaller one of two spheres of almost the same size getting the lowest resolution defined in the shadow textures “Min. size” and “Max. size” range settings.
Set the “Min. size” higher for similar cases.