diff --git a/regression-test/suites/compaction/test_mow_compaction_agg_and_remove_pre_delete_bitmap.groovy b/regression-test/suites/compaction/test_mow_compaction_agg_and_remove_pre_delete_bitmap.groovy
index 0c0fda5d1c2991..62167d545f6889 100644
--- a/regression-test/suites/compaction/test_mow_compaction_agg_and_remove_pre_delete_bitmap.groovy
+++ b/regression-test/suites/compaction/test_mow_compaction_agg_and_remove_pre_delete_bitmap.groovy
@@ -191,7 +191,9 @@ suite("test_mow_compaction_agg_and_remove_pre_delete_bitmap", "nonConcurrent") {
 
         def tablets = sql_return_maparray """ show tablets from ${testTable}; """
         logger.info("tablets: " + tablets)
-        assertEquals(1, tablets.size())
+        // BUCKETS 1 => exactly one tablet; the cluster may create multiple replicas,
+        // so show tablets returns one row per replica. Assert by distinct tablet id.
+        assertEquals(1, tablets.collect { it.TabletId }.unique().size())
         def tablet = tablets[0]
 
         // 1. write some data
@@ -278,7 +280,9 @@ suite("test_mow_compaction_agg_and_remove_pre_delete_bitmap", "nonConcurrent") {
 
         tablets = sql_return_maparray """ show tablets from ${testTable}; """
         logger.info("tablets: " + tablets)
-        assertEquals(1, tablets.size())
+        // BUCKETS 1 => exactly one tablet; the cluster may create multiple replicas,
+        // so show tablets returns one row per replica. Assert by distinct tablet id.
+        assertEquals(1, tablets.collect { it.TabletId }.unique().size())
         tablet = tablets[0]
 
         // 1. write some data
diff --git a/regression-test/suites/compaction/test_mow_compaction_and_read_stale.groovy b/regression-test/suites/compaction/test_mow_compaction_and_read_stale.groovy
index bfd1a41cf36502..ef9047c3a1bdf5 100644
--- a/regression-test/suites/compaction/test_mow_compaction_and_read_stale.groovy
+++ b/regression-test/suites/compaction/test_mow_compaction_and_read_stale.groovy
@@ -203,7 +203,9 @@ suite("test_mow_compaction_and_read_stale", "nonConcurrent") {
 
     def tablets = sql_return_maparray """ show tablets from ${testTable}; """
     logger.info("tablets: " + tablets)
-    assertEquals(1, tablets.size())
+    // BUCKETS 1 => exactly one tablet; the cluster may create multiple replicas,
+    // so show tablets returns one row per replica. Assert by distinct tablet id.
+    assertEquals(1, tablets.collect { it.TabletId }.unique().size())
     def tablet = tablets[0]
     String tablet_id = tablet.TabletId
 
diff --git a/regression-test/suites/compaction/test_mow_compaction_and_schema_change.groovy b/regression-test/suites/compaction/test_mow_compaction_and_schema_change.groovy
index 5c4dbbedd3fff5..b248c9370f46d1 100644
--- a/regression-test/suites/compaction/test_mow_compaction_and_schema_change.groovy
+++ b/regression-test/suites/compaction/test_mow_compaction_and_schema_change.groovy
@@ -216,7 +216,9 @@ suite("test_mow_compaction_and_schema_change", "nonConcurrent") {
 
             def tablets = sql_return_maparray """ show tablets from ${testTable}; """
             logger.info("tablets: " + tablets)
-            assertEquals(1, tablets.size())
+            // BUCKETS 1 => exactly one tablet; the cluster may create multiple replicas,
+            // so show tablets returns one row per replica. Assert by distinct tablet id.
+            assertEquals(1, tablets.collect { it.TabletId }.unique().size())
             def tablet = tablets[0]
 
             // 1. write some data