diff --git a/src/Providers/ShippingServiceProvider.php b/src/Providers/ShippingServiceProvider.php
index 2b77e83..4ad386c 100644
--- a/src/Providers/ShippingServiceProvider.php
+++ b/src/Providers/ShippingServiceProvider.php
@@ -26,7 +26,7 @@ use Modules\Core\Shipping\Carriers\BoxNow\BoxNowRateDriver;
 use Modules\Core\Shipping\Contracts\CarrierFulfillmentInterface;
 use Modules\Core\Shipping\Filament\Pages\ManageShippingRates;
 use Modules\Core\Shipping\Jobs\PollShipmentTrackingJob;
-use Modules\Core\Shipping\Listeners\FlushLivePricingCache;
+use Modules\Core\Shipping\Listeners\InvalidateShippingOptions;
 use Modules\Core\Shipping\Models\Shipment;
 
 class ShippingServiceProvider extends ServiceProvider
@@ -70,7 +70,7 @@ class ShippingServiceProvider extends ServiceProvider
         });
 
         foreach ([CartLineAdded::class, CartLineUpdated::class, CartLineRemoved::class, CartCleared::class, ShippingAddressSet::class] as $event) {
-            Event::listen($event, [FlushLivePricingCache::class, 'handle']);
+            Event::listen($event, [InvalidateShippingOptions::class, 'handle']);
         }
 
         // Deferred: the Shipping facade resolves a binding registered in
diff --git a/src/Shipping/Concerns/CachesLivePricing.php b/src/Shipping/Concerns/CachesLivePricing.php
index 5df6887..a069ab5 100644
--- a/src/Shipping/Concerns/CachesLivePricing.php
+++ b/src/Shipping/Concerns/CachesLivePricing.php
@@ -17,7 +17,7 @@ use Lunar\Shipping\Models\ShippingRate;
  * across carts: the quote depends on cart-specific weight/quantity/
  * destination (see docs/checkout.md).
  *
- * Invalidated by Modules\Core\Shipping\Listeners\FlushLivePricingCache on
+ * Invalidated by Modules\Core\Shipping\Listeners\InvalidateShippingOptions on
  * the only two things that can change what this cart's quote should be: a
  * cart line changing (add/update/remove/clear) or the shipping address
  * changing. Deliberately NOT invalidated on order placement — the price
diff --git a/src/Shipping/Listeners/FlushLivePricingCache.php b/src/Shipping/Listeners/InvalidateShippingOptions.php
similarity index 53%
rename from src/Shipping/Listeners/FlushLivePricingCache.php
rename to src/Shipping/Listeners/InvalidateShippingOptions.php
index b772b07..dc7d893 100644
--- a/src/Shipping/Listeners/FlushLivePricingCache.php
+++ b/src/Shipping/Listeners/InvalidateShippingOptions.php
@@ -3,6 +3,7 @@
 namespace Modules\Core\Shipping\Listeners;
 
 use Illuminate\Support\Facades\Cache;
+use Lunar\Facades\ShippingManifest;
 use Lunar\Shipping\Facades\Shipping;
 use Lunar\Shipping\Models\ShippingRate;
 use Modules\Core\Cart\Events\CartCleared;
@@ -13,17 +14,29 @@ use Modules\Core\Checkout\Events\ShippingAddressSet;
 use Modules\Core\Shipping\Contracts\SupportsLivePricing;
 
 /**
- * Flushes Modules\Core\Shipping\Concerns\CachesLivePricing's cached quotes
- * for a cart on the only two things that can change what they should be: a
+ * Invalidates everything that caches or memoises resolved shipping options
+ * for a cart, on the only two things that can change what they should be: a
  * cart line changing (weight/quantity) or the shipping address changing
- * (destination). See that trait's docblock for why order placement is
- * deliberately not a trigger here.
+ * (destination).
  *
- * Only rates whose method's driver implements SupportsLivePricing are ever
- * cached by CachesLivePricing, so only their ids need a forget() call —
- * no need to touch every ShippingRate row on every cart change.
+ * Two things need clearing here, both stale for the same reason:
+ *
+ * - Modules\Core\Shipping\Concerns\CachesLivePricing's per-rate cache (see
+ *   that trait's docblock for why order placement is deliberately not a
+ *   trigger). Only rates whose method's driver implements
+ *   SupportsLivePricing are ever cached by it, so only their ids need a
+ *   forget() call — no need to touch every ShippingRate row on every cart
+ *   change.
+ * - Lunar\Base\ShippingManifest's $options collection, which is a
+ *   request-lifetime singleton: ShippingManifest::getOptions() re-runs the
+ *   modifier pipeline on every call but never clears $options first, and
+ *   addOption() keeps the first entry per identifier and silently drops any
+ *   later one — so an option resolved for an earlier address/cart state
+ *   shadows the correct one after that state changes, within the same
+ *   request. clearOptions() forces the next getOptions() call to resolve
+ *   fresh.
  */
-class FlushLivePricingCache
+class InvalidateShippingOptions
 {
     public function handle(CartLineAdded|CartLineUpdated|CartLineRemoved|CartCleared|ShippingAddressSet $event): void
     {
@@ -32,6 +45,8 @@ class FlushLivePricingCache
         foreach ($this->livePricingRateIds() as $rateId) {
             Cache::forget("shipping.live_price.{$rateId}.{$cart->id}");
         }
+
+        ShippingManifest::clearOptions();
     }
 
     /**