diff --git a/base_tier_validation/models/tier_validation.py b/base_tier_validation/models/tier_validation.py
index 29896f80..65158aa1 100644
--- a/base_tier_validation/models/tier_validation.py
+++ b/base_tier_validation/models/tier_validation.py
@@ -853,7 +853,18 @@ def restart_validation(self):
     def _update_counter(self, review_counter):
         self.review_ids._update_review_status()
         channel = "base.tier.validation/updated"
-        self.env.user.partner_id._bus_send(channel, review_counter)
+        # Notify the reviewers whose pending count actually changes, not the
+        # acting user. Sending the delta to ``self.env.user`` made unrelated
+        # users' systray counters drift (even negative) whenever someone acted
+        # on a tier-validated record without being one of its reviewers. When
+        # the reviews are already gone (deletions), fall back to the acting
+        # user. The client recomputes the absolute count on receipt, so the
+        # exact audience only affects how promptly a reviewer sees the update.
+        partners = self.review_ids.mapped("reviewer_ids.partner_id")
+        if not partners:
+            partners = self.env.user.partner_id
+        for partner in partners:
+            partner._bus_send(channel, review_counter)
 
     def unlink(self):
         self.mapped("review_ids").unlink()
diff --git a/base_tier_validation/static/src/components/tier_review_menu/tier_review_menu.esm.js b/base_tier_validation/static/src/components/tier_review_menu/tier_review_menu.esm.js
index 553796b8..1c7de6d0 100644
--- a/base_tier_validation/static/src/components/tier_review_menu/tier_review_menu.esm.js
+++ b/base_tier_validation/static/src/components/tier_review_menu/tier_review_menu.esm.js
@@ -16,8 +16,18 @@ export class TierReviewMenu extends Component {
         this.orm = useService("orm");
         this.store = useState(useService("mail.store"));
         this.action = useService("action");
+        this.busService = useService("bus_service");
         this.dropdown = useDropdownState();
         this.fetchSystrayReviewer();
+        // Keep the badge live and correct: re-fetch the authoritative count
+        // whenever a tier review changes server-side, instead of nudging a
+        // running +/- delta. The absolute value is a len() and so can never go
+        // negative, which a delta could when an update reaches a user for whom
+        // the review was never part of their pending count.
+        this.busService.subscribe("base.tier.validation/updated", () =>
+            this.fetchSystrayReviewer()
+        );
+        this.busService.start();
     }
 
     async fetchSystrayReviewer() {
diff --git a/base_tier_validation/static/src/js/services/tier_review_service.esm.js b/base_tier_validation/static/src/js/services/tier_review_service.esm.js
deleted file mode 100644
index bde257be..00000000
--- a/base_tier_validation/static/src/js/services/tier_review_service.esm.js
+++ /dev/null
@@ -1,33 +0,0 @@
-import {reactive} from "@odoo/owl";
-import {registry} from "@web/core/registry";
-
-export class TierReviewService {
-    constructor(env, services) {
-        this.env = env;
-        this.store = services["mail.store"];
-        this.busService = services.bus_service;
-    }
-    setup() {
-        this.busService.subscribe("base.tier.validation/updated", (payload) => {
-            if (payload.review_created) {
-                this.store.tierReviewCounter++;
-            }
-            if (payload.review_deleted) {
-                this.store.tierReviewCounter--;
-            }
-        });
-        this.busService.start();
-    }
-}
-
-export const tierReviewService = {
-    dependencies: ["bus_service", "mail.store"],
-
-    start(env, services) {
-        const tier_review_service = reactive(new TierReviewService(env, services));
-        tier_review_service.setup();
-        return tier_review_service;
-    },
-};
-
-registry.category("services").add("tierReviewService", tierReviewService);