If you look at the two attached screen shots. The date range picker is initialized with a start and end date. If the start date is changed, the end date is reset to 1/1/0001.
I have configured the date range picker as:
<TelerikDateRangePicker @bind-StartValue="@NewRecSet.StartDate" @bind-EndValue="@NewRecSet.EndDate" Min="DateTime.Today"/>
My expectation is that the end date should not change from what was set as the initial value.