react-big-calendar onSelectSlot returns last day of the week only in production

Question

I am using react-big-calendar and when i select a empty slot using onSelectSlot it return the the end date in calendar.for eg: if the visible dates are from sunday to saturday it always return saturdays date even if the selected slot is from monday and this only happens in production. Ref: I have selected 11-May 1:00 to 1:30 but it returns 18-May's 1:00 to 1:30 as shown in image

I want the onSelectSlot to return the date which is selected instead of last day in the week.