Os x finder - sorting by date - today/no date issues

Is there any logic behind OS X's file sorting patterns?

Here is a screenshot of two file dialogs open side by side:

Why on the left it is labeled as "no date" and on the right it is "today"?

What is the purpose of "no date" anyway? Isn't it kind of useless, especially appearing on the very bottom of the list?

Is there any fix for this?

PS I'm on Mavericks.