diff --git a/pinot-core/src/main/java/org/apache/pinot/core/operator/filter/BitmapCollection.java b/pinot-core/src/main/java/org/apache/pinot/core/operator/filter/BitmapCollection.java
index b3f40ed41f6b..04fddee856e3 100644
--- a/pinot-core/src/main/java/org/apache/pinot/core/operator/filter/BitmapCollection.java
+++ b/pinot-core/src/main/java/org/apache/pinot/core/operator/filter/BitmapCollection.java
@@ -86,11 +86,10 @@ public int orCardinality(BitmapCollection bitmaps) {
       if (!bitmaps._inverted) {
         return ImmutableRoaringBitmap.orCardinality(left, right);
       }
-      return _numDocs - right.getCardinality() - ImmutableRoaringBitmap.andCardinality(left, right);
+      return _numDocs - right.getCardinality() + ImmutableRoaringBitmap.andCardinality(left, right);
     } else {
       if (!bitmaps._inverted) {
-        return _numDocs - left.getCardinality()
-            + ImmutableRoaringBitmap.andCardinality(right, left);
+        return _numDocs - left.getCardinality() + ImmutableRoaringBitmap.andCardinality(right, left);
       }
       return _numDocs - ImmutableRoaringBitmap.andCardinality(left, right);
     }
diff --git a/pinot-core/src/test/java/org/apache/pinot/core/operator/filter/BitmapCollectionTest.java b/pinot-core/src/test/java/org/apache/pinot/core/operator/filter/BitmapCollectionTest.java
index e7985a0369e1..5224b35f9d79 100644
--- a/pinot-core/src/test/java/org/apache/pinot/core/operator/filter/BitmapCollectionTest.java
+++ b/pinot-core/src/test/java/org/apache/pinot/core/operator/filter/BitmapCollectionTest.java
@@ -171,7 +171,7 @@ public static Object[][] orCardinalityTestCases() {
         },
         {
             10, ImmutableRoaringBitmap.bitmapOf(0, 5), false,
-            ImmutableRoaringBitmap.bitmapOf(0, 4), true, 7
+            ImmutableRoaringBitmap.bitmapOf(0, 4), true, 9
         },
         {
             10, ImmutableRoaringBitmap.bitmapOf(0, 5), false,
diff --git a/pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/OfflineClusterIntegrationTest.java b/pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/OfflineClusterIntegrationTest.java
index f323a88b7a25..9e287cb28473 100644
--- a/pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/OfflineClusterIntegrationTest.java
+++ b/pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/OfflineClusterIntegrationTest.java
@@ -3762,4 +3762,19 @@ public void testFilteredAggregationWithNoValueMatchingAggregationFilterWithOptio
     // empty groups
     assertEquals(result.get("numRowsResultSet").asInt(), 0);
   }
+
+  @Test(dataProvider = "useBothQueryEngines")
+  public void testFastFilteredCountWithOrFilterOnBitmapWithExclusiveBitmap(boolean useMultiStageQueryEngine)
+      throws Exception {
+    setUseMultiStageQueryEngine(useMultiStageQueryEngine);
+    // Column "Origin" has a range index, and column "DayofMonth" has a sorted index in several segments. This means
+    // that the count aggregation will be executed using the fast filtered count operator in these segments. The range
+    // index will produce a non-inverted bitmap collection and the sorted index will produce an inverted bitmap
+    // collection (since the filter predicate is exclusive).
+
+    // See this issue - https://github.com/apache/pinot/issues/14486
+    testQuery(
+        "SELECT COUNT(*) FROM mytable WHERE Origin BETWEEN 'ALB' AND 'LMT' OR DayofMonth <> 2"
+    );
+  }
 }