Currently if you drag weekly event from Tuesday to Wednesday for example and change to edit series it is not being changed to Wednesday. It stays on Tuesday. I think most of people would expect it to be rescheduled for Wednesday.
I still see this problem on the demo. I create a screencast to demonstrate it http://screencast.com/t/QecINApLT
Cannot reproduce it following the steps you specified on this demo: http://demos.kendoui.com/web/scheduler/index.html If you still experience this with the latest version (2013.3.1119), contact our support on kendoui.com for further assistance.