diff --git a/.github/workflows/runTests.yml b/.github/workflows/runTests.yml
index a49035037..022dca7f5 100644
--- a/.github/workflows/runTests.yml
+++ b/.github/workflows/runTests.yml
@@ -36,7 +36,7 @@ jobs:
   build_and_test_mex:
     strategy:
       matrix:
-        platform: [windows-latest, ubuntu-22.04, macos-15-intel, macos-latest]
+        platform: [windows-2022, ubuntu-22.04, macos-15-intel, macos-latest]
     runs-on: ${{ matrix.platform }}
     needs: [build_cpp]
  
diff --git a/API/checkRange.m b/API/checkRange.m
new file mode 100644
index 000000000..5ffce380f
--- /dev/null
+++ b/API/checkRange.m
@@ -0,0 +1,36 @@
+function problemStruct = checkRange(problemStruct, limits)
+    % Check the range of fitted parameters, remove parameter from fit if range is too small.
+    %
+    % Parameters
+    % ----------
+    % problemStruct : struct
+    %     The project struct.
+    % limits : struct
+    %     The limits for each parameter.
+    %
+    % Returns
+    % -------
+    % problemStruct : struct
+    %     The project struct with fit information.
+    fields = {"params", "backgroundParams", "scalefactors", "bulkIns",...
+        "bulkOuts", "resolutionParams", "domainRatios"};
+    titles = {"Parameter", "Background parameter", "Scalefactor", "Bulk in",...
+        "Bulk out", "Resolution parameter", "Domain ratio"};
+
+    for i = 1:length(fields)
+        fitIndices = find(problemStruct.checks.(fields{i}));
+
+        for j = 1:length(fitIndices)
+            lower = limits.(fields{i})(fitIndices(j),1);
+            upper = limits.(fields{i})(fitIndices(j),2);
+            
+            if (upper - lower) < 1e-10
+                paramName = problemStruct.names.(fields{i}){fitIndices(j)};
+                warning('%s "%s" was removed from the fit because its range is too small (< 1e-10).', titles{i}, paramName);
+                problemStruct.checks.(fields{i})(fitIndices(j)) = 0;
+            end
+        end
+    end
+
+end
+
diff --git a/API/parseClassToStructs.m b/API/parseClassToStructs.m
index 553571b1e..ff58997d2 100644
--- a/API/parseClassToStructs.m
+++ b/API/parseClassToStructs.m
@@ -290,6 +290,9 @@
     problemStruct.checks.domainRatios = ones(1,0);
 end
 
+if ~strcmpi(inputControls.procedure, procedures.Calculate.value)
+    problemStruct = checkRange(problemStruct, limits);
+end
 % Make sure the indices cannot lie outside of the arrays
 checkIndices(problemStruct, inputStruct.files);
 
diff --git a/API/parseOutToProjectClass.m b/API/parseOutToProjectClass.m
index 6b157a409..3e6f80b0c 100644
--- a/API/parseOutToProjectClass.m
+++ b/API/parseOutToProjectClass.m
@@ -6,43 +6,43 @@
 %(1) Parameters
 params = problemStruct.params;
 for i = 1:length(params)
-    project.setParameter(i, 'value', params(i));
+    project.setParameter(i, 'value', params(i), 'fit', logical(problemStruct.checks.params(i)));
 end
 
 %(2) Backgrounds
 backgroundParams = problemStruct.backgroundParams;
 for i = 1:length(backgroundParams)
-    project.setBackgroundParam(i, 'value', backgroundParams(i));
+    project.setBackgroundParam(i, 'value', backgroundParams(i), 'fit', logical(problemStruct.checks.backgroundParams(i)));
 end
 
 %(3) Scalefactors
 scalefactors = problemStruct.scalefactors;
 for i = 1:length(scalefactors)
-    project.setScalefactor(i,'value',scalefactors(i));
+    project.setScalefactor(i,'value',scalefactors(i), 'fit', logical(problemStruct.checks.scalefactors(i)));
 end
 
 %(4) Bulk In
 bulkIns = problemStruct.bulkIns;
 for i = 1:length(bulkIns)
-    project.setBulkIn(i,'value',bulkIns(i));
+    project.setBulkIn(i,'value',bulkIns(i), 'fit', logical(problemStruct.checks.bulkIns(i)));
 end
 
 %(5) Bulk Out
 bulkOuts = problemStruct.bulkOuts;
 for i = 1:length(bulkOuts)
-    project.setBulkOut(i,'value',bulkOuts(i));
+    project.setBulkOut(i,'value',bulkOuts(i), 'fit', logical(problemStruct.checks.bulkOuts(i)));
 end
 
 %(6) Resolutions
 resolutionParams = problemStruct.resolutionParams;
 for i = 1:length(resolutionParams)
-    project.setResolutionParam(i,'value',resolutionParams(i));
+    project.setResolutionParam(i,'value',resolutionParams(i), 'fit', logical(problemStruct.checks.resolutionParams(i)));
 end
 
 % (7) Domain ratio
 if strcmpi(problemStruct.TF, calculationTypes.Domains.value)
     domainRatios = problemStruct.domainRatios;
     for i = 1:length(domainRatios)
-        project.setDomainRatio(i,'value',domainRatios(i));
+        project.setDomainRatio(i,'value',domainRatios(i), 'fit', logical(problemStruct.checks.domainRatios(i)));
     end
 end