diff --git a/src/pages-service/tickets/components/TicketHome.vue b/src/pages-service/tickets/components/TicketHome.vue
index f404799..644128b 100644
--- a/src/pages-service/tickets/components/TicketHome.vue
+++ b/src/pages-service/tickets/components/TicketHome.vue
@@ -135,6 +135,9 @@ const groupOffsets = ref([])
 const rightScrollTop = ref(0)
 const instance = getCurrentInstance()
 const productsById = computed(() => new Map(props.products.map((product) => [product.id, product])))
+const groupLayoutSignature = computed(() => props.groups
+  .map((group) => `${group.id}:${(group.productIds || []).join(',')}`)
+  .join('|'))
 
 const productsForGroup = (group) => (group.productIds || [])
   .map((productId) => productsById.value.get(productId))
@@ -197,7 +200,10 @@ const handleProductScroll = (event) => {
 }
 
 onMounted(measureGroupOffsets)
-watch(() => props.groups.map((group) => group.id).join(','), measureGroupOffsets)
+watch(groupLayoutSignature, () => {
+  groupOffsets.value = []
+  measureGroupOffsets()
+}, { flush: 'post' })
 
 const makePhoneCall = () => {
   if (!props.scenicSpot.phone) return
diff --git a/src/pages-service/tickets/view-contract.test.mjs b/src/pages-service/tickets/view-contract.test.mjs
index 4b8dd00..247a0bf 100644
--- a/src/pages-service/tickets/view-contract.test.mjs
+++ b/src/pages-service/tickets/view-contract.test.mjs
@@ -60,6 +60,9 @@ test("storefront synchronizes the left category from right-column scrolling", as
   assert.match(source, /groupOffsets/);
   assert.match(source, /scrollTop/);
   assert.match(source, /leftScrollIntoViewId/);
+  assert.match(source, /groupLayoutSignature/);
+  assert.match(source, /group\.productIds/);
+  assert.match(source, /groupOffsets\.value = \[\]/);
   assert.match(source, /TopNavBar/);
 });