diff --git a/charts/selenium-grid/templates/_helpers.tpl b/charts/selenium-grid/templates/_helpers.tpl
index 33784a278..03a1463a5 100644
--- a/charts/selenium-grid/templates/_helpers.tpl
+++ b/charts/selenium-grid/templates/_helpers.tpl
@@ -340,6 +340,22 @@ Component update strategy template
 {{ $spec | nindent 4 }}
 {{- end -}}
 
+{{/*
+Replica count for a distributed component (Distributor, SessionQueue, SessionMap).
+The value from `.replicas` is honored only when the component's external datastore is
+enabled, since replicas share state through it. Without an external datastore, running
+multiple replicas would break the grid (no shared state), so the count is forced to 1.
+Pass the component config, e.g. `.Values.components.distributor`.
+*/}}
+{{- define "seleniumGrid.component.replicaCount" -}}
+{{- $component := . -}}
+{{- if (dig "externalDatastore" "enabled" false $component) -}}
+{{- max 1 ($component.replicas | int) -}}
+{{- else -}}
+1
+{{- end -}}
+{{- end -}}
+
 {{/*
 Common pod template
 */}}
diff --git a/charts/selenium-grid/templates/distributor-deployment.yaml b/charts/selenium-grid/templates/distributor-deployment.yaml
index 2cf08d0cd..39cab32b1 100644
--- a/charts/selenium-grid/templates/distributor-deployment.yaml
+++ b/charts/selenium-grid/templates/distributor-deployment.yaml
@@ -11,7 +11,7 @@ metadata:
 spec:
   strategy:
     {{- template "seleniumGrid.updateStrategy" (list $.Values.components.distributor $.Values.global.seleniumGrid) }}
-  replicas: {{ max 1 (.Values.components.distributor.replicas | int) }}
+  replicas: {{ include "seleniumGrid.component.replicaCount" .Values.components.distributor }}
   revisionHistoryLimit: {{ .Values.global.seleniumGrid.revisionHistoryLimit }}
   selector:
     matchLabels:
diff --git a/charts/selenium-grid/templates/session-map-deployment.yaml b/charts/selenium-grid/templates/session-map-deployment.yaml
index 08703dbdc..166f6fef9 100644
--- a/charts/selenium-grid/templates/session-map-deployment.yaml
+++ b/charts/selenium-grid/templates/session-map-deployment.yaml
@@ -11,7 +11,7 @@ metadata:
 spec:
   strategy:
     {{- template "seleniumGrid.updateStrategy" (list $.Values.components.sessionMap $.Values.global.seleniumGrid) }}
-  replicas: {{ max 1 (.Values.components.sessionMap.replicas | int) }}
+  replicas: {{ include "seleniumGrid.component.replicaCount" .Values.components.sessionMap }}
   revisionHistoryLimit: {{ .Values.global.seleniumGrid.revisionHistoryLimit }}
   selector:
     matchLabels:
diff --git a/charts/selenium-grid/templates/session-queue-deployment.yaml b/charts/selenium-grid/templates/session-queue-deployment.yaml
index 976ca0e25..f3a64c71c 100644
--- a/charts/selenium-grid/templates/session-queue-deployment.yaml
+++ b/charts/selenium-grid/templates/session-queue-deployment.yaml
@@ -11,7 +11,7 @@ metadata:
 spec:
   strategy:
     {{- template "seleniumGrid.updateStrategy" (list $.Values.components.sessionQueue $.Values.global.seleniumGrid) }}
-  replicas: {{ max 1 (.Values.components.sessionQueue.replicas | int) }}
+  replicas: {{ include "seleniumGrid.component.replicaCount" .Values.components.sessionQueue }}
   revisionHistoryLimit: {{ .Values.global.seleniumGrid.revisionHistoryLimit }}
   selector:
     matchLabels: