What a strange problem

Pleasse look at this snippet : http://webix.com/snippet/de5a005d

Each time you change value in a select box, there is a message ‘on’.
As long as you don’t blur the list, everything is working well.
If you click on button save, it count how many select have been changed. If you come back on list and changed value, the onChange is not working weel. Sometimes it’s reacting, somtimes not.
Try,

  1. Change 3 select. See event onChange is raising (message ‘on’ is displaying)
  2. Click on Save . It show the number of changed Select.
  3. Change others Select and see that event is not raisong normally.

Very big problem. I am blocked.
Thanks