Nothing has changed. Those styles work just as well today as they have always done. Some possible explanations:
- Some other program is modifying the window style of your edit control.
- Some other program is automating your application and setting the text of the control programmatically. For instance, an on-screen keyboard.
- Your users are pasting values into the edit control rather than typing them.
I suggest that you contact your users and ask them to describe precisely how they are putting these values into the control.