diff --git a/frontend/src/components/PermissionIpLocations.test.ts b/frontend/src/components/PermissionIpLocations.test.ts
index 1baafc2f..ed1ba034 100644
--- a/frontend/src/components/PermissionIpLocations.test.ts
+++ b/frontend/src/components/PermissionIpLocations.test.ts
@@ -47,11 +47,12 @@ describe("PermissionIpLocations", () => {
     expect(source).not.toContain('all: "近 90 天"');
   });
 
-  it("keeps fullscreen animation sharp without multiplying large canvas layers", () => {
+  it("keeps fullscreen animation sharp without dirty-rect artifacts or extra canvas layers", () => {
     const source = readSource();
 
     expect(source).toContain('v-if="!fullscreenVisible"');
-    expect(source).toContain("useDirtyRect: true");
+    expect(source).toContain("useDirtyRect: false");
+    expect(source).not.toContain("useDirtyRect: true");
     expect(source).toContain("Math.min(getDevicePixelRatio(), 2)");
     expect(source).not.toContain("getDevicePixelRatio() * 1.5");
     expect(source).not.toContain("zlevel:");
diff --git a/frontend/src/components/PermissionIpLocations.vue b/frontend/src/components/PermissionIpLocations.vue
index 959d1793..2be0fe97 100644
--- a/frontend/src/components/PermissionIpLocations.vue
+++ b/frontend/src/components/PermissionIpLocations.vue
@@ -223,8 +223,9 @@ const mapLoadError = ref("");
 const mapReady = ref(false);
 const lastUpdatedAt = ref<Date | null>(null);
 const getDevicePixelRatio = () => (typeof window === "undefined" ? 1 : window.devicePixelRatio || 1);
-const chartInitOptions = { devicePixelRatio: Math.min(getDevicePixelRatio(), 2), useDirtyRect: true };
-const fullscreenChartInitOptions = { devicePixelRatio: Math.min(getDevicePixelRatio(), 2), useDirtyRect: true };
+// Animated lines/effectScatter leave cleared rectangles over the geo layer when dirty-rect rendering is enabled.
+const chartInitOptions = { devicePixelRatio: Math.min(getDevicePixelRatio(), 2), useDirtyRect: false };
+const fullscreenChartInitOptions = { devicePixelRatio: Math.min(getDevicePixelRatio(), 2), useDirtyRect: false };
 const chartUpdateOptions = { notMerge: true };
 const chartAutoresize = { throttle: 120 };
 const fullscreenVisible = ref(false);