I apologize if this is not the right forum, but I didn't find any bug report utilities inside kendoui.com.
To topic: according to the thread title, I think there is a bug inside the list-view when editing a listitem after the creation of a new one. Please feel free to proceed the following steps and see for yourself. The problem also appears when using the Kendo UI demo page:
Step 1: add a new item
Step 2: don't cancel creation and try to edit another record
Step 3: edit a second record without canceling the 2nd
Wright now the record from step 2 has overwritten the record from step 3, so that there are the same records twice inside the view. e.g. Chai - Chang - Chang - Chef Anton's Cajun instead of Chai - Chang - Aniseed Syrup - Chef Anton's Cajun
This behaviour has no effect on some sort of datasource or observable, these objects are ok. It seems to be a bug inside the listview widget itself.