diff --git a/src/components/Discover/Map/Filter/Trace.vue b/src/components/Discover/Map/Filter/Trace.vue
index ca497a0..194cd8d 100644
--- a/src/components/Discover/Map/Filter/Trace.vue
+++ b/src/components/Discover/Map/Filter/Trace.vue
@@ -113,7 +113,7 @@ export default {
     },
     chartData: function() {
       const start = this.selectArea[0];
-      const end = this.selectArea[1]-1;
+      const end = this.selectArea[1] - 1;
       const labels = this.traces.map(trace => `#${trace.id}`);
       const data = this.traces.map(trace => this.getPercentLabel(trace.count / this.traceCountTotal));
       const selectAreaData = this.traces.map((trace, index) => index >= start && index <= end ? 'rgba(0,153,255)' : 'rgba(203, 213, 225)');
@@ -132,6 +132,12 @@ export default {
       };
     }
   },
+  watch: {
+    selectArea: function(newValue) {
+      let roundValue = Math.round(newValue[1].toFixed());
+      if(newValue[1] !== roundValue) this.selectArea[1] = roundValue;
+    }
+  },
   methods: {
     /**
      * Set bar chart Options