diff --git a/xs/src/libslic3r/GCode/Analyzer.cpp b/xs/src/libslic3r/GCode/Analyzer.cpp
index 799bd6661e..b7ecee5a4c 100644
--- a/xs/src/libslic3r/GCode/Analyzer.cpp
+++ b/xs/src/libslic3r/GCode/Analyzer.cpp
@@ -718,10 +718,10 @@ void GCodeAnalyzer::_calc_gcode_preview_extrusion_layers(GCodePreviewData& previ
     Helper::store_polyline(polyline, data, z, preview_data);
 
     // updates preview ranges data
-    preview_data.ranges.height.set_from(height_range);
-    preview_data.ranges.width.set_from(width_range);
-    preview_data.ranges.feedrate.set_from(feedrate_range);
-    preview_data.ranges.volumetric_rate.set_from(volumetric_rate_range);
+    preview_data.ranges.height.update_from(height_range);
+    preview_data.ranges.width.update_from(width_range);
+    preview_data.ranges.feedrate.update_from(feedrate_range);
+    preview_data.ranges.volumetric_rate.update_from(volumetric_rate_range);
 }
 
 void GCodeAnalyzer::_calc_gcode_preview_travel(GCodePreviewData& preview_data)
@@ -790,9 +790,9 @@ void GCodeAnalyzer::_calc_gcode_preview_travel(GCodePreviewData& preview_data)
     Helper::store_polyline(polyline, type, direction, feedrate, extruder_id, preview_data);
 
     // updates preview ranges data
-    preview_data.ranges.height.set_from(height_range);
-    preview_data.ranges.width.set_from(width_range);
-    preview_data.ranges.feedrate.set_from(feedrate_range);
+    preview_data.ranges.height.update_from(height_range);
+    preview_data.ranges.width.update_from(width_range);
+    preview_data.ranges.feedrate.update_from(feedrate_range);
 }
 
 void GCodeAnalyzer::_calc_gcode_preview_retractions(GCodePreviewData& preview_data)
diff --git a/xs/src/libslic3r/GCode/PreviewData.cpp b/xs/src/libslic3r/GCode/PreviewData.cpp
index 69fd3524da..c66de08edb 100644
--- a/xs/src/libslic3r/GCode/PreviewData.cpp
+++ b/xs/src/libslic3r/GCode/PreviewData.cpp
@@ -370,7 +370,7 @@ GCodePreviewData::LegendItemsList GCodePreviewData::get_legend_items(const std::
             list.reserve(Range::Colors_Count);
 
             float step = range.step_size();
-            for (unsigned int i = 0; i < Range::Colors_Count; ++i)
+            for (int i = Range::Colors_Count - 1; i >= 0; --i)
             {
                 char buf[1024];
                 sprintf(buf, "%.*f/%.*f", decimals, scale_factor * (range.min + (float)i * step), decimals, scale_factor * (range.min + (float)(i + 1) * step));