diff --git a/packages/backend/src/api/repositories/RepeatedEnrollmentRepository.ts b/packages/backend/src/api/repositories/RepeatedEnrollmentRepository.ts
index afde9a0e1..e5b7d19c8 100644
--- a/packages/backend/src/api/repositories/RepeatedEnrollmentRepository.ts
+++ b/packages/backend/src/api/repositories/RepeatedEnrollmentRepository.ts
@@ -6,23 +6,23 @@ import repositoryError from './utils/repositoryError';
 
 export interface RepeatedEnrollmentDataCount {
   userId: string;
-  decisionPointId: string;
+  experimentId: string;
   count: number;
 }
 @EntityRepository(RepeatedEnrollment)
 export class RepeatedEnrollmentRepository extends Repository<RepeatedEnrollment> {
   public async getRepeatedEnrollmentCount(
     userId: string,
-    decisionPointsIds: string[],
+    experimentIds: string[],
     logger: UpgradeLogger
   ): Promise<RepeatedEnrollmentDataCount[]> {
     const result = await this.createQueryBuilder('repeatedEnrollment')
-      .select(['ie.userId as "userId"', 'ie.partitionId as "decisionPointId"'])
+      .select(['ie.userId as "userId"', 'ie.experimentId as "experimentId"'])
       .addSelect('COUNT(*) as count')
       .leftJoin('repeatedEnrollment.individualEnrollment', 'ie')
       .where('ie.userId = :userId', { userId })
-      .andWhere('ie.partitionId IN (:...decisionPointsIds)', { decisionPointsIds })
-      .groupBy('ie.userId , ie.partitionId , ie.id')
+      .andWhere('ie.experimentId IN (:...experimentIds)', { experimentIds })
+      .groupBy('ie.userId, ie.experimentId')
       .getRawMany()
       .catch((errorMsg: any) => {
         const errorMsgString = repositoryError(
diff --git a/packages/backend/src/api/services/ExperimentAssignmentService.ts b/packages/backend/src/api/services/ExperimentAssignmentService.ts
index a32bb3b48..b15f2a570 100644
--- a/packages/backend/src/api/services/ExperimentAssignmentService.ts
+++ b/packages/backend/src/api/services/ExperimentAssignmentService.ts
@@ -432,13 +432,9 @@ export class ExperimentAssignmentService {
           (experiment) => experiment.assignmentUnit === ASSIGNMENT_UNIT.WITHIN_SUBJECTS
         );
 
-        const allWithinSubjectDecisionPoints = filteredWithinSubjectExperiments
-          .map((experiment) => this.getActiveDecisionPoints(experiment))
-          .flat();
-
         repeatedEnrollmentCounts = await this.repeatedEnrollmentRepository.getRepeatedEnrollmentCount(
           userId,
-          allWithinSubjectDecisionPoints.map((dp) => dp.id),
+          filteredWithinSubjectExperiments.map((experiment) => experiment.id),
           logger
         );
       }
@@ -454,7 +450,7 @@ export class ExperimentAssignmentService {
             conditionPayloads,
             type,
             factors,
-            repeatedEnrollmentCounts || [],
+            repeatedEnrollmentCounts,
             logger
           );
           return [...accumulator, ...decisionPoints];
@@ -894,7 +890,7 @@ export class ExperimentAssignmentService {
     conditionPayloads: ConditionPayloadDTO[],
     type: EXPERIMENT_TYPE,
     factors: FactorDTO[],
-    repeatedEnrollmentCounts: { userId: string; decisionPointId: string; count: number }[],
+    repeatedEnrollmentCounts: RepeatedEnrollmentDataCount[],
     logger: UpgradeLogger
   ): IExperimentAssignmentv5[] {
     return experiment.partitions
@@ -929,9 +925,8 @@ export class ExperimentAssignmentService {
 
         if (experiment.assignmentUnit === ASSIGNMENT_UNIT.WITHIN_SUBJECTS) {
           const count =
-            repeatedEnrollmentCounts.find(
-              (repeatedEnrollment) => repeatedEnrollment.decisionPointId === decisionPoint.id
-            )?.count || 0;
+            repeatedEnrollmentCounts?.find((repeatedEnrollment) => repeatedEnrollment.experimentId === experiment.id)
+              ?.count || 0;
           return withInSubjectType(experiment, conditionPayloads, decisionPoint, factors, userId, count);
         } else {
           const experimentId = experiment.id;
diff --git a/packages/backend/test/unit/services/ExperimentAssignmentService.test.ts b/packages/backend/test/unit/services/ExperimentAssignmentService.test.ts
index 28588d8d2..7f6781b6e 100644
--- a/packages/backend/test/unit/services/ExperimentAssignmentService.test.ts
+++ b/packages/backend/test/unit/services/ExperimentAssignmentService.test.ts
@@ -409,6 +409,47 @@ describe('Experiment Assignment Service Test', () => {
     expect(result[0].assignedCondition).toMatchObject(cond);
   });
 
+  it('should use a single shared rotation counter across all decision points in a within-subject experiment', async () => {
+    const context = 'context';
+    const userDoc = { id: 'user123', group: { schoolId: ['school1'] }, workingGroup: {} };
+    const exp = structuredClone(simpleWithinSubjectOrderedRoundRobinExperiment);
+
+    // Add a second decision point to the experiment
+    const secondPartition = {
+      ...exp.partitions[0],
+      id: 'dp-2-id',
+      twoCharacterId: 'W2',
+      site: 'CurriculumSequence',
+      target: 'W2',
+    };
+    exp.partitions = [...exp.partitions, secondPartition];
+
+    // Simulate the user has already been through the rotation once (count = 1)
+    // For ORDERED_ROUND_ROBIN with 2 conditions and count=1, the second condition should be first
+    const repeatedEnrollmentCount = 1;
+    testedModule.repeatedEnrollmentRepository = {
+      getRepeatedEnrollmentCount: sandbox
+        .stub()
+        .resolves([{ userId: userDoc.id, experimentId: exp.id, count: repeatedEnrollmentCount }]),
+    };
+
+    testedModule.experimentService.getCachedValidExperiments = sandbox.stub().resolves([exp]);
+    testedModule.experimentUserService = { getOriginalUserDoc: sandbox.stub().resolves(userDoc) };
+
+    const result = await testedModule.getAllExperimentConditions(userDoc, context, loggerMock);
+
+    // Both decision points should be returned
+    expect(result.length).toEqual(2);
+
+    // Both DPs must have the same assigned condition order — they share one rotation counter
+    expect(result[0].assignedCondition[0].conditionCode).toEqual(result[1].assignedCondition[0].conditionCode);
+    expect(result[0].assignedCondition[1].conditionCode).toEqual(result[1].assignedCondition[1].conditionCode);
+
+    // With count=1, the rotation should have advanced past position 0 — condition at index 1 should now be first
+    expect(result[0].assignedCondition[0].conditionCode).toEqual(exp.conditions[1].conditionCode);
+    expect(result[0].assignedCondition[1].conditionCode).toEqual(exp.conditions[0].conditionCode);
+  });
+
   it('should return the assigned condition for a simple group experiment', async () => {
     const context = 'context';
     const userDoc = { id: 'user123', group: { 'add-group1': ['school1'] }, workingGroup: { 'add-group1': 'school1' } };