make the results more reproducible

converter/src/main/java/lcsb/mapviewer/converter/ZIndexPopulator.java

@@ -22,6 +22,7 @@ import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.species.field.ModificationResidue;
 import lcsb.mapviewer.model.map.species.field.SpeciesWithModificationResidue;
 import lcsb.mapviewer.model.map.species.field.StructuralState;
+import lcsb.mapviewer.modelutils.map.ElementUtils;
 
 /**
  * This util class populate with z-index data if necessary.
@@ -96,7 +97,7 @@ public class ZIndexPopulator {
       }
 
       private int compareStructuralStates(final StructuralState o1, final StructuralState o2) {
-        return -doubleComparator.compare(o1.getSize(), o2.getSize());
+        return -stringComparator.compare(o1.getElementId(), o2.getElementId());
       }
 
       private int compareReactions(final Reaction o1, final Reaction o2) {