diff --git a/nav2_costmap_2d/src/costmap_2d.cpp b/nav2_costmap_2d/src/costmap_2d.cpp
index 9ddbcf5e9d6..ea2de83e4b4 100644
--- a/nav2_costmap_2d/src/costmap_2d.cpp
+++ b/nav2_costmap_2d/src/costmap_2d.cpp
@@ -303,8 +303,8 @@ bool Costmap2D::worldToMapContinuous(double wx, double wy, float & mx, float & m
     return false;
   }
 
-  mx = static_cast<float>((wx - origin_x_) / resolution_) + 0.5f;
-  my = static_cast<float>((wy - origin_y_) / resolution_) + 0.5f;
+  mx = static_cast<float>((wx - origin_x_) / resolution_);
+  my = static_cast<float>((wy - origin_y_) / resolution_);
 
   if (mx < size_x_ && my < size_y_) {
     return true;
diff --git a/nav2_smac_planner/include/nav2_smac_planner/utils.hpp b/nav2_smac_planner/include/nav2_smac_planner/utils.hpp
index fb020a729a1..8975258dab4 100644
--- a/nav2_smac_planner/include/nav2_smac_planner/utils.hpp
+++ b/nav2_smac_planner/include/nav2_smac_planner/utils.hpp
@@ -46,9 +46,9 @@ inline geometry_msgs::msg::Pose getWorldCoords(
 {
   geometry_msgs::msg::Pose msg;
   msg.position.x =
-    static_cast<float>(costmap->getOriginX()) + (mx - 0.5) * costmap->getResolution();
+    static_cast<float>(costmap->getOriginX()) + mx * costmap->getResolution();
   msg.position.y =
-    static_cast<float>(costmap->getOriginY()) + (my - 0.5) * costmap->getResolution();
+    static_cast<float>(costmap->getOriginY()) + my * costmap->getResolution();
   return msg;
 }
 
diff --git a/nav2_smac_planner/test/test_smoother.cpp b/nav2_smac_planner/test/test_smoother.cpp
index b216972e60d..2f9e6a89697 100644
--- a/nav2_smac_planner/test/test_smoother.cpp
+++ b/nav2_smac_planner/test/test_smoother.cpp
@@ -176,12 +176,19 @@ TEST(SmootherTest, test_full_smoother)
   double max_no_time = 0.0;
   EXPECT_FALSE(smoother->smooth(plan, costmap, max_no_time));
 
-  // Failure mode: Path is in collision, do 2x to exercise overlapping point
-  // attempts to update orientation should also fail
-  pose.pose.position.x = 1.25;
-  pose.pose.position.y = 1.25;
-  plan.poses.push_back(pose);
-  plan.poses.push_back(pose);
+  // Failure mode: invalid path and invalid orientation
+  // make the end of the path invalid
+  geometry_msgs::msg::PoseStamped lastPose = plan.poses.back();
+  unsigned int mx, my;
+  costmap->worldToMap(lastPose.pose.position.x, lastPose.pose.position.y, mx, my);
+  for (unsigned int i = mx - 5; i <= mx + 5; ++i) {
+    for (unsigned int j = my - 5; j <= my + 5; ++j) {
+      costmap->setCost(i, j, 254);
+    }
+  }
+
+  // duplicate last pose to make the orientation update fail
+  plan.poses.push_back(lastPose);
   EXPECT_FALSE(smoother->smooth(plan, costmap, maxtime));
   EXPECT_NEAR(plan.poses.end()[-2].pose.orientation.z, 1.0, 1e-3);
   EXPECT_NEAR(plan.poses.end()[-2].pose.orientation.x, 0.0, 1e-3);