problem in Default Value of CF Edited

[RainBow]

Hello
I created a custom field(select list(single choice)) and set default value for it, but this value don't show in screen for this CF, and show "None" for it  and should  select value from list!!!

I know the custom field configuration and this problem first appeared to me. :(
Where is problem?How do I fix it?
Thanks

[RainBow]

Hi

This field in create screen has a default value(Not None), but in any screen in workflow don't had a value and display "None" in field.