Scheduler events rendering problem

Hi guys

I have a problem. I changed datastore(in-Memory) of sample Scheduler (Calendar) demo to Ajax-store, I changed CalendarMappings properly, so store is loaded with right records I can see it in debugger, but on main panel renders only one event in a day. If there is one event everything looks great, but if I add another events CalendarPanel shows only one per day.

I cant understand where source of the problem

Scheduler events rendering problem