diff --git a/src/components/audioManagement/audioManagement.tsx b/src/components/audioManagement/audioManagement.tsx
index 54361d0..6869370 100644
--- a/src/components/audioManagement/audioManagement.tsx
+++ b/src/components/audioManagement/audioManagement.tsx
@@ -101,7 +101,8 @@ class AudioManagement extends React.Component<AllProps> {
       this.repaintWaveform(
         this.props.sections,
         this.props.measures,
-        this.props.zoomLevel
+        this.props.zoomLevel,
+        this.props.secondsPerMeasure
       );
     }
 
@@ -125,7 +126,8 @@ class AudioManagement extends React.Component<AllProps> {
       this.repaintWaveform(
         this.props.sections,
         this.props.measures,
-        this.props.zoomLevel
+        this.props.zoomLevel,
+        this.props.secondsPerMeasure
       );
     }
 
@@ -165,11 +167,12 @@ class AudioManagement extends React.Component<AllProps> {
   private repaintWaveform(
     sections: NormalizedObjects<Section>,
     measures: NormalizedObjects<Measure>,
-    zoomLevel: number
+    zoomLevel: number,
+    timePerMeasure: number
   ) {
     this.getPeaks()?.segments.removeAll();
     this.getPeaks()?.segments.add(
-      PeaksConfig.sectionsToSegment(sections, measures)
+      PeaksConfig.sectionsToSegment(sections, measures, timePerMeasure)
     );
     this.getPeaks()?.points.removeAll();
     this.getPeaks()?.points.add(PeaksConfig.measuresToPoints(measures));
diff --git a/src/components/audioManagement/peaksConfig.ts b/src/components/audioManagement/peaksConfig.ts
index 91dd881..d36d01e 100644
--- a/src/components/audioManagement/peaksConfig.ts
+++ b/src/components/audioManagement/peaksConfig.ts
@@ -37,18 +37,21 @@ class PeaksConfig {
 
   static sectionsToSegment = (
     sections: NormalizedObjects<Section>,
-    measures: NormalizedObjects<Measure>
+    measures: NormalizedObjects<Measure>,
+    timePerMeasure: number
   ) => {
     let segments: SegmentAddOptions[] = [];
     sections.allIds.forEach(id => {
       const section = sections.byId[id];
 
+      const start = measures.byId[section.measures[0]].time;
+      const end = start + timePerMeasure;
+
       let segment: SegmentAddOptions = {
         id,
         labelText: section.type,
-        startTime: measures.byId[section.measures[0]].time,
-        endTime:
-          measures.byId[section.measures[section.measures.length - 1]].time,
+        startTime: start,
+        endTime: end,
         color: PeaksConfig.SECTIONTYPE_TO_COLOR.get(section.type),
         editable: false
       };
diff --git a/src/states/analysis/analysisSlice.test.ts b/src/states/analysis/analysisSlice.test.ts
index 6681baf..12212f5 100644
--- a/src/states/analysis/analysisSlice.test.ts
+++ b/src/states/analysis/analysisSlice.test.ts
@@ -161,7 +161,7 @@ it("can remove sections after changing rhythm", () => {
 
   expect(state.sections.allIds.length).toBe(2);
   expect(state.sections.byId["BRIDGE_0_98"]).toBeDefined();
-  expect(state.sections.byId["UNDEFINED_98_99"]).toBeDefined();
+  expect(state.sections.byId["UNDEFINED_99_99"]).toBeDefined();
 
   state = reducer(state, updatedRhythm({ bpm: 60 }));
 
diff --git a/src/states/analysis/analysisUtil.ts b/src/states/analysis/analysisUtil.ts
index 5057a56..de8d664 100644
--- a/src/states/analysis/analysisUtil.ts
+++ b/src/states/analysis/analysisUtil.ts
@@ -35,7 +35,7 @@ export const undefinedSection = (length: number) => {
 
 export const sectionInvalid = (section: Section) => {
   return (
-    parseInt(section.measures[0]) >=
+    parseInt(section.measures[0]) >
     parseInt(section.measures[section.measures.length - 1])
   );
 };
@@ -82,7 +82,7 @@ export const mergeSections: (
   //Add a new undefined block before the new section
   if (newSectionStart > currentSectionStart) {
     let section: Section = {
-      measures: ArrayUtil.range(currentSectionStart, newSectionStart),
+      measures: ArrayUtil.range(currentSectionStart, newSectionStart - 1),
       type: SectionType.UNDEFINED
     };
     newSections.push(section);
@@ -94,7 +94,7 @@ export const mergeSections: (
   //Add a new undefined block after the new section
   if (newSectionEnd < currentSectionEnd) {
     let section: Section = {
-      measures: ArrayUtil.range(newSectionEnd, currentSectionEnd),
+      measures: ArrayUtil.range(newSectionEnd + 1, currentSectionEnd),
       type: SectionType.UNDEFINED
     };
     newSections.push(section);