diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
index 6b4f00a8c..0bbaa19c4 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
@@ -323,7 +323,7 @@ bool GLGizmoHollow::is_mesh_point_clipped(const Vec3d& point) const
     if (m_clipping_plane_distance == 0.f)
         return false;
 
-    Vec3d transformed_point = m_model_object->instances.front()->get_transformation().get_matrix() * point;
+    Vec3d transformed_point = m_model_object->instances[m_active_instance]->get_transformation().get_matrix() * point;
     transformed_point(2) += m_z_shift;
     return m_clipping_plane->is_point_clipped(transformed_point);
 }
@@ -534,7 +534,7 @@ bool GLGizmoHollow::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_pos
     return false;
 }
 
-void GLGizmoHollow::delete_selected_points(bool force)
+void GLGizmoHollow::delete_selected_points()
 {
     Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Delete drainage hole")));
 
@@ -564,10 +564,10 @@ std::pair<const TriangleMesh *, sla::HollowingConfig> GLGizmoHollow::get_hollowi
     // FIXME this function is probably obsolete, caller could
     // get the data from model config himself
     std::vector<const ConfigOption*> opts = get_config_options({"hollowing_min_thickness", "hollowing_quality", "hollowing_closing_distance"});
-    float offset = static_cast<const ConfigOptionFloat*>(opts[0])->value;
-    float quality = static_cast<const ConfigOptionFloat*>(opts[1])->value;
-    float closing_d = static_cast<const ConfigOptionFloat*>(opts[2])->value;
-    return std::make_pair(m_mesh, sla::HollowingConfig{double(offset), double(quality), double(closing_d)});
+    double offset = static_cast<const ConfigOptionFloat*>(opts[0])->value;
+    double quality = static_cast<const ConfigOptionFloat*>(opts[1])->value;
+    double closing_d = static_cast<const ConfigOptionFloat*>(opts[2])->value;
+    return std::make_pair(m_mesh, sla::HollowingConfig{offset, quality, closing_d});
 }
 
 void GLGizmoHollow::update_mesh_raycaster(std::unique_ptr<MeshRaycaster> &&rc)
@@ -833,10 +833,10 @@ RENDER_AGAIN:
 
         if (remove_all) {
             select_point(AllPoints);
-            delete_selected_points(true); // true - delete regardless of locked status
+            delete_selected_points();
         }
         if (remove_selected)
-            delete_selected_points(false); // leave locked points
+            delete_selected_points();
 
         if (first_run) {
             first_run = false;
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.hpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.hpp
index 1c548e14a..8e022eb1e 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.hpp
@@ -48,7 +48,7 @@ public:
     ~GLGizmoHollow() override;
     void set_sla_support_data(ModelObject* model_object, const Selection& selection);
     bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down);
-    void delete_selected_points(bool force = false);
+    void delete_selected_points();
     ClippingPlane get_sla_clipping_plane() const;
     
     
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
index ac3dd8058..cf3f91dac 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
@@ -377,7 +377,7 @@ bool GLGizmoSlaSupports::is_mesh_point_clipped(const Vec3d& point) const
     if (m_clipping_plane_distance == 0.f)
         return false;
 
-    Vec3d transformed_point = m_model_object->instances.front()->get_transformation().get_matrix() * point;
+    Vec3d transformed_point = m_model_object->instances[m_active_instance]->get_transformation().get_matrix() * point;
     transformed_point(2) += m_z_shift;
     return m_clipping_plane->is_point_clipped(transformed_point);
 }