Index: src_plugins/export_openems/mesh.c
===================================================================
--- src_plugins/export_openems/mesh.c	(revision 32014)
+++ src_plugins/export_openems/mesh.c	(revision 32015)
@@ -1029,6 +1029,18 @@
 	ia_load_file(fname);
 }
 
+static void mesh_sort_uniq(pcb_mesh_lines_t *l)
+{
+		qsort(l->result.array, vtc0_len(&l->result), sizeof(rnd_coord_t), cmp_coord);
+}
+
+static void mesh_sort_uniq_all(pcb_mesh_t *mesh)
+{
+	mesh_sort_uniq(&mesh->line[PCB_MESH_HORIZONTAL]);
+	mesh_sort_uniq(&mesh->line[PCB_MESH_VERTICAL]);
+	mesh_sort_uniq(&mesh->line[PCB_MESH_Z]);
+}
+
 static void ia_gen(void)
 {
 	mesh_layer_reset();
@@ -1043,6 +1055,8 @@
 	if (mesh.ui_layer_z != NULL)
 		mesh_vis_z(&mesh);
 
+	mesh_sort_uniq_all(&mesh);
+
 	free(mesh.ui_name_xy);
 	free((char *)mesh.ui_layer_xy->name); /* we have strdup'd it */
 	mesh.ui_name_xy = rnd_strdup_printf("mesh 0: %s", mesh.layer->name);