Fix TING calculation

Author: dburren

lib/report_plugins/glucosedistribution.js

@@ -543,7 +543,7 @@ glucosedistribution.report = function report_glucosedistribution (datastorage, s
   var tar4count = !result.Up.ignore + tar3count;
 
   var preg1 = parseFloat(result.Normal.readingspct) + parseFloat(result.Lowish.readingspct);
-  var preg2 = result.Up.readingspct + preg1;
+  var preg2 = parseFloat(result.Up.readingspct) + parseFloat(preg1);
 
   var titr = parseFloat(result.Normal.readingspct) + parseFloat(result.Up.readingspct);
   var titrcount = !result.Normal.ignore + !result.Up.ignore;