Toggle Field doesn't store default value

http://ee400.dev/admin.php?/cp/fields/edit/14

Created a Toggle Field.

Set the value to “on”

Saved the field.

Went back to edit the field.

Default value was set to “off”

Tried again… same thing.

https://www.dropbox.com/s/sji76bjuc8xfjmq/Screenshot 2017-10-25 12.08.16.png?dl=0