Why don't newly created routes show up in my 'today' smart list?

Hi all,

I have a smart list with the rules, creation date or modification date is today. When I create a route and then create some waypoints to add into it the waypoints always show up in the smart list, but not the route. In fact when I sort My Collection by date, the new route is seemingly randomly positioned someway down the list below items from several days or weeks ago. 

Why is this happening? How can I make sure the new route immediately appears in 'today' once I have created it?

Thanks in advance!