I saw this and just thought a user had set a random time zone. Thanks for pointing it out mate
It is the Member Profile Fields plugin. Just did an experiment with it: edited the timezone field in dashboard with random crap, and the first option line of random crap is what displays on a user account. Note, that if a user does not explicitly set a timezone in their WPforo account it will not affect anything in the Wordpress user dashboard - you as Admin, also cannot set the timezone in the WP user dashboard, setting it there won't stick.
Interestingly, no matter what you edit the options to be in the Member Profile Fields plugin, those will not display as options in the Wordpress user dashboard, so a major disconnect there.
What I will likely do in the Member Profile Fields plugin is disable that field in profile, registration and account zones. I don't really see much for that field to be honest
The issues related to the select box, additional value adding, and similar problems have been fixed. These fixes will be integrated into the next version of wpForo.
I suggest that WPforo set the default site WP timezone as default for users that don't explicitly set their own selection.

