diff --git a/src/DrawingProgram/DrawingProgramSelection.cpp b/src/DrawingProgram/DrawingProgramSelection.cpp
index 00d20c6..c9a3595 100644
--- a/src/DrawingProgram/DrawingProgramSelection.cpp
+++ b/src/DrawingProgram/DrawingProgramSelection.cpp
@@ -364,6 +364,10 @@ void DrawingProgramSelection::expand_selection_with_groups() {
     for(auto* c : drawP.layerMan.get_flattened_component_list()) {
         if(c->obj->groupId != 0 && groupIds.contains(c->obj->groupId) && !already.contains(c)
            && drawP.layerMan.can_current_peer_edit_layer(c->obj->parentLayer)) {
+            // Same as click/lasso select: must leave the draw cache, otherwise
+            // transforms move the selection draw while the BVH surface stays put
+            // (looks like size-dependent drift between group members).
+            drawP.drawCache.erase_component(c);
             selectedSet.push_back(c);
             already.insert(c);
         }