Kyle
Ansys Employee

The cell group spans of the EME solver object itself (like in your screenshot) are used to define the cross-section and initial length of each cell group, if you sweep them without changing the geometry as well then they will not line up with the geometry properly, as you have seen. To perform a sweep of the length of a cell group with the EME solver you should use the propagation sweep feature in the EME analysis window:
This will properly sweep the length of the section of the geometry in that cell group, without having to recalculate the modes.