diff --git a/src/opt_group.f90 b/src/opt_group.f90
index 45029f2..c3edc8a 100644
--- a/src/opt_group.f90
+++ b/src/opt_group.f90
@@ -37,16 +37,27 @@ module opt_group
 
         call parse_group(arg_pos)
 
-        call get_group
 
         !Now call the transformation functions for the group
-        if(displace) call displace_group
+         if(refine) then 
+            call get_group
+            call refine_group
+        end if
 
-        if(remesh_size > 0) call remesh_group
+        if(displace)then 
+            call get_group
+            call displace_group
+        end if
 
-        if(delete) call delete_group
+        if(delete)then 
+            call get_group
+            call delete_group
+        end if
 
-        if(refine) call refine_group
+        if(remesh_size > 0)then 
+            call get_group
+            call remesh_group
+        end if
 
     end subroutine group
 
@@ -360,7 +371,11 @@ module opt_group
             return
         end select
 
-        !Allocate variables to arbitrary size
+        !Reset group if needed
+        if(allocated(element_index)) deallocate(element_index,atom_index)
+
+        group_ele_num = 0
+        group_atom_num = 0
         allocate(element_index(1024), atom_index(1024))
         !Check the type to see whether we need to find the elements within the group
         select case(trim(adjustl(type)))