Inaccurate Timezone at bottom of forum page
 

In my Admin CP > vBulletin Options > Date and Time Options... I have it set to "GMT -5 Eastern Time Zone".

I assume this meant that my forum's default timezone would now be set to the above, unless a user logs in and their profile is set to another timezone.

However, for unregistered/guest visitors, the bottom of my forum is showing this:
All times are GMT -4. The time now is 01:13 AM.

Note that it is showing "GMT -4" and not "GMT -5" (so it is not matching my Admin CP selection).

Is this behaving as-designed or an error?