Hey Zack, sorry, I thought you were not supporting the plugin anymore, that’s why I didn’t start by leaving a post in the support forums.
The date is correct but the status of the post is still draft:
Status: Draft
Visibility: Public
Schedule for: Dec 29, 2017 @ 14:52
So, it seems that the fact the status is not changed from Draft to Scheduled is blocking the publishing. I guess.
As far as I know I don’t use any other plugin changing post schedules.