diff --git a/frontend/src/metabase/visualizations/lib/LineAreaBarRenderer.js b/frontend/src/metabase/visualizations/lib/LineAreaBarRenderer.js
index 37b9359b3c144c8e8e27fbc4f67476f1e90d9353..ff4f99e33ee3e01f0499f4fc8ac7b4709ee45316 100644
--- a/frontend/src/metabase/visualizations/lib/LineAreaBarRenderer.js
+++ b/frontend/src/metabase/visualizations/lib/LineAreaBarRenderer.js
@@ -715,7 +715,8 @@ export default function lineAreaBar(element, { series, onHoverChange, onRender,
         if (isTimeseries) {
             // replace xValues with
             xValues = d3.time[xInterval.interval]
-                .range(xDomain[0], moment(xDomain[1]).add(1, "ms"), xInterval.count);
+                .range(xDomain[0], moment(xDomain[1]).add(1, "ms"), xInterval.count)
+                .map(d => moment(d));
             datas = fillMissingValues(
                 datas,
                 xValues,
@@ -806,7 +807,9 @@ export default function lineAreaBar(element, { series, onHoverChange, onRender,
     let yExtents = groups.map(group => d3.extent(group[0].all(), d => d.value));
     let yExtent = d3.extent([].concat(...yExtents));
 
-    if (!isScalarSeries && !isScatter && !isStacked && settings["graph.y_axis.auto_split"] !== false) {
+    // don't auto-split if the metric columns are all identical, i.e. it's a breakout multiseries
+    const hasDifferentYAxisColumns = _.uniq(series.map(s => s.data.cols[1])).length > 1;
+    if (!isScalarSeries && !isScatter && !isStacked && hasDifferentYAxisColumns && settings["graph.y_axis.auto_split"] !== false) {
         yAxisSplit = computeSplit(yExtents);
     } else {
         yAxisSplit = [series.map((s,i) => i)];