diff --git a/app/controllers/report_controller.rb b/app/controllers/report_controller.rb
--- a/app/controllers/report_controller.rb
+++ b/app/controllers/report_controller.rb
@@ -164,7 +164,7 @@
 
       #sum into best
       if @by_lang and @by_lang.first
-        @best = @by_lang.first[1]
+        @best = @by_lang.first[1].clone
         @by_lang.each do |lang,prop|
           if @best[:runtime][:value] >= prop[:runtime][:value]
             @best[:runtime] = prop[:runtime]