diff --git a/WcaOnRails/lib/results_validators/scrambles_validator.rb b/WcaOnRails/lib/results_validators/scrambles_validator.rb
index d6b9916404..417f32c16f 100644
--- a/WcaOnRails/lib/results_validators/scrambles_validator.rb
+++ b/WcaOnRails/lib/results_validators/scrambles_validator.rb
@@ -7,6 +7,8 @@ class ScramblesValidator < GenericValidator
     UNEXPECTED_SCRAMBLES_FOR_ROUND_ERROR = "[%{round_id}] Too many scrambles. Use Scrambles Matcher to uncheck the unused scrambles."
     MISSING_SCRAMBLES_FOR_GROUP_ERROR = "[%{round_id}] Group %{group_id}: missing scrambles, detected only %{actual} instead of %{expected}."
     MISSING_SCRAMBLES_FOR_MULTI_ERROR = "[%{round_id}] While you may have multiple groups in 3x3x3 Multi-Blind, at least one of the groups must contain scrambles for all attempts."
+    MULTIPLE_FMC_GROUPS_WARNING = "[%{round_id}] There are multiple groups of FMC used. If one group of FMC was used, please use the Scrambles Matcher to uncheck the unused "\
+      "scrambles. Otherwise, please include a comment to WRT explaining why multiple groups of FMC were used."
 
     @@desc = "This validator checks that all results have matching scrambles, and if possible, checks that the scrambles have the correct number of attempts compared to the expected round format."
 
@@ -82,6 +84,11 @@ def validate(competition_ids: [], model: Result, results: nil)
                                                       expected: expected_number_of_scrambles)
             end
           end
+          if round_id.start_with?("333fm") && scrambles_by_group_id.size > 1
+            @warnings << ValidationWarning.new(:scrambles, competition_id,
+                                               MULTIPLE_FMC_GROUPS_WARNING,
+                                               round_id: round_id)
+          end
           if round_id.start_with?("333mbf")
             unless errors_for_round.size < scrambles_by_group_id.keys.size
               @errors << ValidationError.new(:scrambles, competition_id,
diff --git a/WcaOnRails/spec/factories/results.rb b/WcaOnRails/spec/factories/results.rb
index 8ba4e74ced..c07b980e34 100644
--- a/WcaOnRails/spec/factories/results.rb
+++ b/WcaOnRails/spec/factories/results.rb
@@ -33,6 +33,18 @@
       value5 { 0 }
     end
 
+    trait :fm do
+      eventId { "333fm" }
+      formatId { "m" }
+      average { 3500 }
+      best { 35 }
+      value1 { best }
+      value2 { best }
+      value3 { best }
+      value4 { 0 }
+      value5 { 0 }
+    end
+
     trait :mo3 do
       formatId { "m" }
       average { best }
diff --git a/WcaOnRails/spec/lib/results_validators/scrambles_validator_spec.rb b/WcaOnRails/spec/lib/results_validators/scrambles_validator_spec.rb
index aa0aeb1ce5..69869636ca 100644
--- a/WcaOnRails/spec/lib/results_validators/scrambles_validator_spec.rb
+++ b/WcaOnRails/spec/lib/results_validators/scrambles_validator_spec.rb
@@ -9,6 +9,7 @@
   context "on InboxResult and Result" do
     let!(:competition1) { FactoryBot.create(:competition, :past, event_ids: ["333oh", "333mbf"]) }
     let!(:competition2) { FactoryBot.create(:competition, :past, event_ids: ["222", "333bf", "333mbf"]) }
+    let!(:competition3) { FactoryBot.create(:competition, :past, event_ids: ["333fm"]) }
 
     # The idea behind this variable is the following: the validator can be applied
     # on either a particular model for given competition ids, or on a set of results.
@@ -16,8 +17,8 @@
     let(:validator_args) {
       [InboxResult, Result].flat_map { |model|
         [
-          { competition_ids: [competition1.id, competition2.id], model: model },
-          { results: model.sorted_for_competitions([competition1.id, competition2.id]), model: model },
+          { competition_ids: [competition1.id, competition2.id, competition3.id], model: model },
+          { results: model.sorted_for_competitions([competition1.id, competition2.id, competition3.id]), model: model },
         ]
       }
     }
@@ -85,6 +86,32 @@
         end
       end
 
+      it "correctly (in)validates multiple groups for 333fm" do
+        FactoryBot.create(:round, competition: competition3, event_id: "333fm", format_id: "m")
+
+        [Result, InboxResult].each do |model|
+          result_kind = model.model_name.singular.to_sym
+          FactoryBot.create(result_kind, :fm, competition: competition3)
+        end
+
+        # Create two groups in fmc:
+        create_scramble_set(3, competitionId: competition3.id, eventId: "333fm", groupId: "A")
+        create_scramble_set(3, competitionId: competition3.id, eventId: "333fm", groupId: "B")
+
+        expected_warnings = [
+          RV::ValidationWarning.new(:scrambles, competition3.id,
+                                    SV::MULTIPLE_FMC_GROUPS_WARNING,
+                                    round_id: "333fm-f"),
+        ]
+
+        validator_args.each do |arg|
+          sv = SV.new.validate(arg)
+          expect(sv.warnings).to match_array(expected_warnings)
+          puts sv.errors
+          expect(sv.errors).to be_empty
+        end
+      end
+
       it "correctly (in)validates multiple groups for 333mbf" do
         FactoryBot.create(:round, competition: competition1, event_id: "333mbf", format_id: "3")
         FactoryBot.create(:round, competition: competition2, event_id: "333mbf", format_id: "3")